Added api for session id of topic readers

[alex268]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 72.22222% with 5 lines in your changes missing coverage. Please review.

Project coverage is 58.73%. Comparing base (c96dfe7) to head (39931b3).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
...java/tech/ydb/topic/read/impl/AsyncReaderImpl.java	62.50%	3 Missing ⚠️
.../java/tech/ydb/topic/read/impl/SyncReaderImpl.java	75.00%	1 Missing ⚠️
...db/topic/read/impl/events/SessionStartedEvent.java	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #481      +/-   ##
============================================
+ Coverage     58.71%   58.73%   +0.01%     
- Complexity     2179     2184       +5     
============================================
  Files           324      325       +1     
  Lines         13071    13089      +18     
  Branches       1278     1278              
============================================
+ Hits           7675     7688      +13     
- Misses         4773     4778       +5     
  Partials        623      623              

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