Bazel client: mock out read/write calls

Make blaze::ReadFileDescriptor(int fd, ...) and
blaze::WriteFile(int fd, ...) platform-independent
by mocking out the read(2) and write(2) calls.

Also rename ReadFileDescriptor to ReadFrom and
introduce a new WriteTo method that encapsulates
WriteFile's prior logic.

In particular these functions now take a
read_func/write_func function argument instead of
a file descriptor, so the read(2)/write(2) calls
can be mocked out.

This allows us to use these functions on Windows
too, where read(2)/write(2) are not implemented,
and we can inject a different
read_func/write_func.

See https://github.com/bazelbuild/bazel/issues/2107

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MOS_MIGRATED_REVID=140195973

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