perf: Change StreamingReadRpc::Read interface to take ResponseType

[andrewro-google]

This allows the caller to allocate the ResponseType on an arena and better matches the underlying GRPC interface

TESTED=bazel test //google/... --test_tag_filters=-integration-test,-benchmark,-sample

---

This change is 

[scotthart]

/gcbrun

[andrewro-google]

Fixed the generator and now bazel test //... --test_tag_filters=-integration-test,-benchmark,-sample and bazel build //... passes

[scotthart]

/gcbrun

[andrewro-google]

Fixed clang errors

[andrewro-google]

Friendly ping

[scotthart]

/gcbrun

[codecov]

Codecov Report

❌ Patch coverage is 99.16840% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.03%. Comparing base (8e234ce) to head (7e75022).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...cloud/bigtable/internal/default_row_reader_test.cc	98.16%	2 Missing ⚠️
...v1/internal/golden_kitchen_sink_connection_impl.cc	85.71%	1 Missing ⚠️
...loud/internal/resumable_streaming_read_rpc_test.cc	98.36%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #15319    +/-   ##
========================================
  Coverage   93.03%   93.03%            
========================================
  Files        2403     2403            
  Lines      219441   219553   +112     
========================================
+ Hits       204148   204272   +124     
+ Misses      15293    15281    -12     

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[scotthart]

/gcbrun

[andrewro-google]

Friendly ping. Seem like the only tests not running need another level of approval

[scotthart]

@scotthart reviewed 23 of 29 files at r1, 8 of 8 files at r2, 4 of 4 files at r3, 2 of 2 files at r4, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @andrewro-google)

[andrewro-google]

@BenWhitehead could you take a look as a member of gcs-sdk-team? Thanks!

[scotthart]

/gcbrun

[bajajneha27]

Why are we returning nullopt instead of the response?

[andrewro-google]

Read's API now returns nullopt when there are more results coming or the final RPC Status. In this test we have a few results before sending a final status::OK

[bajajneha27]

@BenWhitehead could you take a look as a member of gcs-sdk-team? Thanks!

@andrewro-google I reviewed on behalf of gcs-sdk-team.

[scotthart]

/gcbrun