feat: StreamWriterV2 will handle schema/streamName attachment

[yayi-google]

…the connection and remove stream name and schema in the following ones.

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Fixes #<issue_number_goes_here> ☕️

[codecov]

Codecov Report

Merging #877 (be27cbc) into master (237c827) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #877      +/-   ##
============================================
+ Coverage     80.85%   80.89%   +0.04%     
- Complexity     1014     1016       +2     
============================================
  Files            76       76              
  Lines          5500     5512      +12     
  Branches        423      424       +1     
============================================
+ Hits           4447     4459      +12     
  Misses          880      880              
  Partials        173      173              

Impacted Files	Coverage Δ	Complexity Δ
...cloud/bigquery/storage/v1beta2/StreamWriterV2.java	96.01% <100.00%> (+0.25%)	34.00 <7.00> (+2.00)

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