Added validation of entry type in describeTable method

[alex268]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 68.75000% with 10 lines in your changes missing coverage. Please review.

Project coverage is 58.83%. Comparing base (58b78c5) to head (0c97615).

Files with missing lines	Patch %	Lines
...src/main/java/tech/ydb/table/impl/BaseSession.java	68.75%	2 Missing and 8 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #388      +/-   ##
============================================
- Coverage     58.84%   58.83%   -0.02%     
- Complexity     2171     2172       +1     
============================================
  Files           320      320              
  Lines         12916    12923       +7     
  Branches       1266     1267       +1     
============================================
+ Hits           7601     7603       +2     
- Misses         4705     4708       +3     
- Partials        610      612       +2     

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