Improve performance of BigQueryIO connector when withPropagateSuccessfulStorageApiWrites(true) is used

[slilichenko]

Minor updates to the way TableRows are re-constructed from the proto messages used for calls to the Storage Write API.

Profiling showed over 50% improvement in the CPU utilization in the code branch related to this re-construction.

Additional optimization is possible if the STORAGE_API_AT_LEAST_ONCE method is used. Another PR will be submitted as the follow up to this one.

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[ahmedabu98]

LGTM

[slilichenko]

@ahmedabu98 - I don't have permissions to merge the PR. Could you please, or someone with committer privileges, merge it and mention which release this PR will be available in?

[ahmedabu98]

Release 2.58.0 has been cut a while ago. This will make it in for version 2.59.0.

Sorry for not asking earlier, but could you add an entry in CHANGES.md mentioning this improvement?

[slilichenko]

@ahmedabu98 - added a line to the 2.59.0 section. When is the SNAPSHOT build going to be available and what's the tentative release date?

[ahmedabu98]

We build snapshots on a daily basis, so probably tomorrow. If all goes well, 2.59.0 should be released mid/late September