Merge Release 4.10.1 into Master (#896)

* Version bumps for Firebase 4.10.1 (#891)

* Minimal fix for b/74357976 (#890)

Fixes b/74357976 which caused unauthenticated users to be unable to reach the Firestore backend and updates the changelog.

* Copy all C++ strings to NSString where they're not obviously safe (#893)

This fixes a known instances of memory corruption where in
FSTLevelDBMutationQueue, the NSString view was retained for later, and
the incorrect user was used, causing b/74381054.

gRPC does not necessarily copy its string argumnets and if our hostname
were configured to a non-default one it's possible that we could corrupt
the host cache too.

All remaining usages of util::WrapNSStringNoCopy are obviously safe:
passed into logging or other known transient usages.

* fix lint

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