Added support of SnapshotRW transaction level

[alex268]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.95%. Comparing base (c851506) to head (ed4ab06).

Files with missing lines	Patch %	Lines
.../main/java/tech/ydb/common/transaction/TxMode.java	0.00%	1 Missing ⚠️
...y/src/main/java/tech/ydb/query/impl/TxControl.java	75.00%	1 Missing ⚠️
...c/main/java/tech/ydb/table/impl/TxControlToPb.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #560      +/-   ##
============================================
+ Coverage     62.91%   62.95%   +0.03%     
+ Complexity     2444     2443       -1     
============================================
  Files           332      332              
  Lines         13969    13974       +5     
  Branches       1409     1409              
============================================
+ Hits           8789     8797       +8     
+ Misses         4534     4531       -3     
  Partials        646      646              

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