Migrate gRPC channels to GCS v2 APIs

[mprashanthsagar]

No description provided.

[mprashanthsagar]

/gcbrun

[codecov]

Codecov Report

Merging #590 (28b3b23) into master (96acdcd) will increase coverage by 0.01%.
The diff coverage is 90.56%.

@@             Coverage Diff              @@
##             master     #590      +/-   ##
============================================
+ Coverage     80.25%   80.26%   +0.01%     
- Complexity     2085     2087       +2     
============================================
  Files           142      143       +1     
  Lines          9155     9160       +5     
  Branches       1086     1088       +2     
============================================
+ Hits           7347     7352       +5     
+ Misses         1359     1358       -1     
- Partials        449      450       +1     

Flag	Coverage Δ
hadoop2integrationtest	60.11% <77.35%> (-0.02%)	⬇️
hadoop2unittest	68.58% <90.56%> (+0.01%)	⬆️
hadoop3integrationtest	60.07% <77.35%> (-0.08%)	⬇️
hadoop3unittest	68.62% <90.56%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
...adoop/gcsio/GoogleCloudStorageGrpcReadChannel.java	84.90% <87.50%> (ø)
...doop/gcsio/GoogleCloudStorageGrpcWriteChannel.java	77.07% <91.17%> (-0.53%)	⬇️
...om/google/cloud/hadoop/gcsio/GrpcChannelUtils.java	100.00% <100.00%> (ø)
...google/cloud/hadoop/gcsio/StorageStubProvider.java	77.60% <100.00%> (ø)
...ogle/cloud/hadoop/gcsio/PrefixMappedItemCache.java	67.53% <0.00%> (+2.59%)	⬆️

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[mprashanthsagar]

Once #594 and #595 are merged, and this PR is re-based, a lot of formatting changes would be removed.