feat: BigQuery Write API V1Beta2 public interface.

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PiperOrigin-RevId: 339152802
Source-Link: googleapis/googleapis@b3c2eb0

[codecov]

Codecov Report

Merging #637 into master will increase coverage by 0.06%.
The diff coverage is 79.27%.

@@             Coverage Diff              @@
##             master     #637      +/-   ##
============================================
+ Coverage     78.73%   78.79%   +0.06%     
- Complexity      660      718      +58     
============================================
  Files            59       65       +6     
  Lines          3766     4263     +497     
  Branches        249      253       +4     
============================================
+ Hits           2965     3359     +394     
- Misses          689      786      +97     
- Partials        112      118       +6     

Impacted Files	Coverage Δ	Complexity Δ
...gquery/storage/v1beta2/BaseBigQueryReadClient.java	43.90% <ø> (ø)	10.00 <0.00> (ø)
...gquery/storage/v1beta2/stub/BigQueryWriteStub.java	14.28% <14.28%> (ø)	1.00 <1.00> (?)
...igquery/storage/v1beta2/BigQueryWriteSettings.java	17.94% <17.94%> (ø)	2.00 <2.00> (?)
...v1beta2/stub/GrpcBigQueryWriteCallableFactory.java	37.50% <37.50%> (ø)	3.00 <3.00> (?)
.../bigquery/storage/v1beta2/BigQueryWriteClient.java	53.84% <53.84%> (ø)	24.00 <24.00> (?)
...torage/v1beta2/stub/BigQueryWriteStubSettings.java	88.71% <88.71%> (ø)	15.00 <15.00> (?)
...ry/storage/v1beta2/stub/GrpcBigQueryWriteStub.java	94.28% <94.28%> (ø)	13.00 <13.00> (?)
...storage/v1beta2/stub/BigQueryReadStubSettings.java	88.95% <100.00%> (+3.68%)	12.00 <0.00> (ø)
... and 4 more

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