Updated partition start implementation

[alex268]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.98131% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.92%. Comparing base (597ebc0) to head (3eedb3d).

Files with missing lines	Patch %	Lines
...tech/ydb/topic/read/impl/PartitionSessionImpl.java	78.78%	6 Missing and 1 partial ⚠️
...main/java/tech/ydb/topic/read/impl/ReaderImpl.java	86.79%	5 Missing and 2 partials ⚠️
...ad/impl/events/StartPartitionSessionEventImpl.java	80.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #604      +/-   ##
============================================
+ Coverage     68.65%   68.92%   +0.26%     
- Complexity     3096     3105       +9     
============================================
  Files           355      355              
  Lines         15305    15278      -27     
  Branches       1624     1623       -1     
============================================
+ Hits          10508    10530      +22     
+ Misses         4131     4084      -47     
+ Partials        666      664       -2     

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