Logic from Table::MutateRow() will be moved here and this commit
proposes the general structure of this class, for early review.

And unconditionally return an error status for the aggregation
mutations, which we don't currently support.

…quest.

Currently in use only for SetCell.

…anging.

…ion.

- Introduces a RowTransaction class to proxy mutations and record undo
  logs in case we needs to rewind.
- Re-implements the SetCell mutation in the RowTransaction class.
- Introduces all Undo types/actions for SetCell and records them in an
  undo stack.
- For SetCell only and to facilitate testing with only SetCell
  mutations, introduces the use of RowTransaction in doing the mutation.
- clang-format is run on all affected files (which has removed some
  headers, e.t.c.

A test for SetCell is coming up and is not currently included here.

…ulator.

…cted table.

Populate a schema protobuf with the minimal fields and call
Table::Create();

…utation.

There is a crash later on, in the code that sets up the undo log, that
will be fixed in an upcoming commit.

Without this, GetCurrentTime which exists as a macro in Windows is
expanded, leading to this compilation error:
https://github.com/googleapis/google-cloud-cpp/actions/runs/16149454809/job/45577395445#step:12:3259

This method of fixing this problem is documented and recommended here:
https://protobuf.dev/support/migration/#getcurrenttime

…for_google

Without this, GetCurrentTime which exists as a macro in Windows is
expanded, leading to this compilation error:
https://github.com/googleapis/google-cloud-cpp/actions/runs/16149454809/job/45577395445#step:12:3259

This method of fixing this problem is documented and recommended here:
https://protobuf.dev/support/migration/#getcurrenttime

… a size_t.

The compiler spits out an error in pedantic mode because on 32 bit
platforms, there is a usually the possibility of an overflow. However,
the quantity is guaranteed to be 32
bit (https://github.com/googleapis/googleapis/blob/74657e8a6690b249c048f685124ee3b8473b70b4/google/bigtable/v2/data.proto#L497)
so use int32_t to store it and fix the MSVC compiler warning and failure.

…gth are adjacent.

This will be used in a subsequent PR to correctly determine if 2 Bigtable row
keys are adjacent, given that a Bigtable row key must be at most 4KiB
in length.

This fixes the following build failure on Windows:
https://github.com/googleapis/google-cloud-cpp/actions/runs/16345973765/job/46188441753#step:12:3215

The failures of the build were due to:

- Missing includes leading to errors in template type instantiation
- column_family_test.cc was included in the common library causing
- duplication definitions at link time.

Not sure why these problems did not manifest on Linux which builds and
test cleanly before this change, even with -pedantic and
-pedantic-errors turned on.

The failures of the build were due to:

- Missing includes leading to errors in template type instantiation
- column_family_test.cc was included in the common library causing duplication definitions at link time.

Not sure why these problems did not manifest on Linux which builds and
test cleanly before this change, even with -pedantic and
-pedantic-errors turned on.