Use offsets from StartPartitionSessionResponse in first message commit offsets

[pnv1]

No description provided.

[codecov-commenter]

Codecov Report

Attention: 22 lines in your changes are missing coverage. Please review.

Comparison is base (7e091ee) 39.61% compared to head (6bbd3ae) 39.56%.

Files	Patch %	Lines
...main/java/tech/ydb/topic/read/impl/ReaderImpl.java	0.00%	17 Missing ⚠️
...tech/ydb/topic/read/impl/PartitionSessionImpl.java	0.00%	5 Missing ⚠️

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Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #199      +/-   ##
=============================================
- Coverage      39.61%   39.56%   -0.05%     
  Complexity      1159     1159              
=============================================
  Files            244      244              
  Lines           9587     9599      +12     
  Branches         918      918              
=============================================
  Hits            3798     3798              
- Misses          5523     5535      +12     
  Partials         266      266              

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