Added changefeeds to result of describeTable method

[alex268]

fixes #366

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 69.64286% with 34 lines in your changes missing coverage. Please review.

Project coverage is 58.39%. Comparing base (dbfa5c7) to head (46c58b6).

Files with missing lines	Patch %	Lines
...src/main/java/tech/ydb/table/impl/BaseSession.java	55.00%	21 Missing and 6 partials ⚠️
...h/ydb/table/description/ChangefeedDescription.java	86.20%	2 Missing and 2 partials ⚠️
.../main/java/tech/ydb/table/settings/Changefeed.java	83.33%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #369      +/-   ##
============================================
+ Coverage     57.72%   58.39%   +0.66%     
- Complexity     2055     2092      +37     
============================================
  Files           311      312       +1     
  Lines         12550    12610      +60     
  Branches       1245     1246       +1     
============================================
+ Hits           7245     7364     +119     
+ Misses         4712     4648      -64     
- Partials        593      598       +5     

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