port `DocumentKey` to non-container types of `Model/*` (#930)

* naively remove FSTPath import and source/test files.

* port FieldPath, part I

* port FieldPath, part II

* port ResourcePath, part I

* port ResourcePath, part II

* the grand commit to fix build errors

* use testutil:: helper instead of those from FSTHelpers

* fix test and lint

* use c_str in errmsg directly

* fix

* fix

* make code clean

* fix integration test I missed

* fix to avoid naming collision in preprocessor

* address changes

* address changes

* address changes

* fix: fieldMask are actually shared with different context.

* address changes

* add converter function between two DocumentKey implementations

* add unit test

* address changes

* fix lint

* using DocumentKey in model except for the container types `FSTDocumentDictionary`, `FSTDocumentKeySet`, and  `FSTDocumentVersionDictionary`

* change other place w.r.t. the use of `DocumentKey` in model

* update parameter of test helpers from NSString to string_view

* revert a temporary change used in debug

* address changes

1 files changed, 24 insertions, 24 deletions

diff --git a/Firestore/Example/Tests/Core/FSTQueryListenerTests.mm b/Firestore/Example/Tests/Core/FSTQueryListenerTests.mm
index 55c4219..bc253d0 100644
--- a/Firestore/Example/Tests/Core/FSTQueryListenerTests.mm
+++ b/Firestore/Example/Tests/Core/FSTQueryListenerTests.mm
@@ -46,10 +46,10 @@ NS_ASSUME_NONNULL_BEGIN
   NSMutableArray<FSTViewSnapshot *> *otherAccum = [NSMutableArray array];
 
   FSTQuery *query = FSTTestQuery("rooms");
-  FSTDocument *doc1 = FSTTestDoc(@"rooms/Eros", 1, @{@"name" : @"Eros"}, NO);
-  FSTDocument *doc2 = FSTTestDoc(@"rooms/Hades", 2, @{@"name" : @"Hades"}, NO);
+  FSTDocument *doc1 = FSTTestDoc("rooms/Eros", 1, @{@"name" : @"Eros"}, NO);
+  FSTDocument *doc2 = FSTTestDoc("rooms/Hades", 2, @{@"name" : @"Hades"}, NO);
   FSTDocument *doc2prime =
-      FSTTestDoc(@"rooms/Hades", 3, @{@"name" : @"Hades", @"owner" : @"Jonny"}, NO);
+      FSTTestDoc("rooms/Hades", 3, @{@"name" : @"Hades", @"owner" : @"Jonny"}, NO);
 
   FSTQueryListener *listener = [self listenToQuery:query accumulatingSnapshots:accum];
   FSTQueryListener *otherListener = [self listenToQuery:query accumulatingSnapshots:otherAccum];
@@ -127,8 +127,8 @@ NS_ASSUME_NONNULL_BEGIN
   NSMutableArray<FSTViewSnapshot *> *accum = [NSMutableArray array];
 
   FSTQuery *query = FSTTestQuery("rooms/Eros");
-  FSTDocument *doc1 = FSTTestDoc(@"rooms/Eros", 3, @{@"name" : @"Eros"}, NO);
-  FSTDocument *doc2 = FSTTestDoc(@"rooms/Eros", 4, @{@"name" : @"Eros2"}, NO);
+  FSTDocument *doc1 = FSTTestDoc("rooms/Eros", 3, @{@"name" : @"Eros"}, NO);
+  FSTDocument *doc2 = FSTTestDoc("rooms/Eros", 4, @{@"name" : @"Eros2"}, NO);
 
   __block FSTAsyncQueryListener *listener = [[FSTAsyncQueryListener alloc]
       initWithDispatchQueue:self.asyncQueue
@@ -167,8 +167,8 @@ NS_ASSUME_NONNULL_BEGIN
   NSMutableArray<FSTViewSnapshot *> *fullAccum = [NSMutableArray array];
 
   FSTQuery *query = FSTTestQuery("rooms");
-  FSTDocument *doc1 = FSTTestDoc(@"rooms/Eros", 1, @{@"name" : @"Eros"}, NO);
-  FSTDocument *doc2 = FSTTestDoc(@"rooms/Hades", 2, @{@"name" : @"Hades"}, NO);
+  FSTDocument *doc1 = FSTTestDoc("rooms/Eros", 1, @{@"name" : @"Eros"}, NO);
+  FSTDocument *doc2 = FSTTestDoc("rooms/Hades", 2, @{@"name" : @"Hades"}, NO);
 
   FSTListenOptions *options = [[FSTListenOptions alloc] initWithIncludeQueryMetadataChanges:YES
                                                              includeDocumentMetadataChanges:NO
@@ -205,10 +205,10 @@ NS_ASSUME_NONNULL_BEGIN
   NSMutableArray<FSTViewSnapshot *> *fullAccum = [NSMutableArray array];
 
   FSTQuery *query = FSTTestQuery("rooms");
-  FSTDocument *doc1 = FSTTestDoc(@"rooms/Eros", 1, @{@"name" : @"Eros"}, YES);
-  FSTDocument *doc2 = FSTTestDoc(@"rooms/Hades", 2, @{@"name" : @"Hades"}, NO);
-  FSTDocument *doc1Prime = FSTTestDoc(@"rooms/Eros", 1, @{@"name" : @"Eros"}, NO);
-  FSTDocument *doc3 = FSTTestDoc(@"rooms/Other", 3, @{@"name" : @"Other"}, NO);
+  FSTDocument *doc1 = FSTTestDoc("rooms/Eros", 1, @{@"name" : @"Eros"}, YES);
+  FSTDocument *doc2 = FSTTestDoc("rooms/Hades", 2, @{@"name" : @"Hades"}, NO);
+  FSTDocument *doc1Prime = FSTTestDoc("rooms/Eros", 1, @{@"name" : @"Eros"}, NO);
+  FSTDocument *doc3 = FSTTestDoc("rooms/Other", 3, @{@"name" : @"Other"}, NO);
 
   FSTListenOptions *options = [[FSTListenOptions alloc] initWithIncludeQueryMetadataChanges:NO
                                                              includeDocumentMetadataChanges:YES
@@ -254,11 +254,11 @@ NS_ASSUME_NONNULL_BEGIN
   NSMutableArray<FSTViewSnapshot *> *fullAccum = [NSMutableArray array];
 
   FSTQuery *query = FSTTestQuery("rooms");
-  FSTDocument *doc1 = FSTTestDoc(@"rooms/Eros", 1, @{@"name" : @"Eros"}, YES);
-  FSTDocument *doc2 = FSTTestDoc(@"rooms/Hades", 2, @{@"name" : @"Hades"}, YES);
-  FSTDocument *doc1Prime = FSTTestDoc(@"rooms/Eros", 1, @{@"name" : @"Eros"}, NO);
-  FSTDocument *doc2Prime = FSTTestDoc(@"rooms/Hades", 2, @{@"name" : @"Hades"}, NO);
-  FSTDocument *doc3 = FSTTestDoc(@"rooms/Other", 3, @{@"name" : @"Other"}, NO);
+  FSTDocument *doc1 = FSTTestDoc("rooms/Eros", 1, @{@"name" : @"Eros"}, YES);
+  FSTDocument *doc2 = FSTTestDoc("rooms/Hades", 2, @{@"name" : @"Hades"}, YES);
+  FSTDocument *doc1Prime = FSTTestDoc("rooms/Eros", 1, @{@"name" : @"Eros"}, NO);
+  FSTDocument *doc2Prime = FSTTestDoc("rooms/Hades", 2, @{@"name" : @"Hades"}, NO);
+  FSTDocument *doc3 = FSTTestDoc("rooms/Other", 3, @{@"name" : @"Other"}, NO);
 
   FSTListenOptions *options = [[FSTListenOptions alloc] initWithIncludeQueryMetadataChanges:YES
                                                              includeDocumentMetadataChanges:NO
@@ -291,10 +291,10 @@ NS_ASSUME_NONNULL_BEGIN
   NSMutableArray<FSTViewSnapshot *> *filteredAccum = [NSMutableArray array];
 
   FSTQuery *query = FSTTestQuery("rooms");
-  FSTDocument *doc1 = FSTTestDoc(@"rooms/Eros", 1, @{@"name" : @"Eros"}, YES);
-  FSTDocument *doc2 = FSTTestDoc(@"rooms/Hades", 2, @{@"name" : @"Hades"}, NO);
-  FSTDocument *doc1Prime = FSTTestDoc(@"rooms/Eros", 1, @{@"name" : @"Eros"}, NO);
-  FSTDocument *doc3 = FSTTestDoc(@"rooms/Other", 3, @{@"name" : @"Other"}, NO);
+  FSTDocument *doc1 = FSTTestDoc("rooms/Eros", 1, @{@"name" : @"Eros"}, YES);
+  FSTDocument *doc2 = FSTTestDoc("rooms/Hades", 2, @{@"name" : @"Hades"}, NO);
+  FSTDocument *doc1Prime = FSTTestDoc("rooms/Eros", 1, @{@"name" : @"Eros"}, NO);
+  FSTDocument *doc3 = FSTTestDoc("rooms/Other", 3, @{@"name" : @"Other"}, NO);
 
   FSTQueryListener *filteredListener =
       [self listenToQuery:query accumulatingSnapshots:filteredAccum];
@@ -323,8 +323,8 @@ NS_ASSUME_NONNULL_BEGIN
   NSMutableArray<FSTViewSnapshot *> *events = [NSMutableArray array];
 
   FSTQuery *query = FSTTestQuery("rooms");
-  FSTDocument *doc1 = FSTTestDoc(@"rooms/Eros", 1, @{@"name" : @"Eros"}, NO);
-  FSTDocument *doc2 = FSTTestDoc(@"rooms/Hades", 2, @{@"name" : @"Hades"}, NO);
+  FSTDocument *doc1 = FSTTestDoc("rooms/Eros", 1, @{@"name" : @"Eros"}, NO);
+  FSTDocument *doc2 = FSTTestDoc("rooms/Hades", 2, @{@"name" : @"Hades"}, NO);
   FSTQueryListener *listener =
       [self listenToQuery:query
                         options:[[FSTListenOptions alloc] initWithIncludeQueryMetadataChanges:NO
@@ -366,8 +366,8 @@ NS_ASSUME_NONNULL_BEGIN
   NSMutableArray<FSTViewSnapshot *> *events = [NSMutableArray array];
 
   FSTQuery *query = FSTTestQuery("rooms");
-  FSTDocument *doc1 = FSTTestDoc(@"rooms/Eros", 1, @{@"name" : @"Eros"}, NO);
-  FSTDocument *doc2 = FSTTestDoc(@"rooms/Hades", 2, @{@"name" : @"Hades"}, NO);
+  FSTDocument *doc1 = FSTTestDoc("rooms/Eros", 1, @{@"name" : @"Eros"}, NO);
+  FSTDocument *doc2 = FSTTestDoc("rooms/Hades", 2, @{@"name" : @"Hades"}, NO);
   FSTQueryListener *listener =
       [self listenToQuery:query
                         options:[[FSTListenOptions alloc] initWithIncludeQueryMetadataChanges:NO