Added describeConsumer method to TopicClient

[alex268]

Fixed #325

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 142 lines in your changes missing coverage. Please review.

Project coverage is 47.32%. Comparing base (6161fb8) to head (680a5d4).

Files with missing lines	Patch %	Lines
...h/ydb/topic/description/ConsumerPartitionInfo.java	0.00%	39 Missing ⚠️
...main/java/tech/ydb/topic/impl/TopicClientImpl.java	0.00%	22 Missing ⚠️
...main/java/tech/ydb/topic/description/Consumer.java	0.00%	16 Missing ⚠️
...h/ydb/topic/settings/DescribeConsumerSettings.java	0.00%	15 Missing ⚠️
...ava/tech/ydb/topic/description/PartitionStats.java	0.00%	13 Missing ⚠️
...java/tech/ydb/topic/description/ConsumerStats.java	0.00%	9 Missing ⚠️
...ech/ydb/topic/description/ConsumerDescription.java	0.00%	8 Missing ⚠️
.../tech/ydb/topic/description/PartitionLocation.java	0.00%	7 Missing ⚠️
...ech/ydb/topic/description/MultipleWindowsStat.java	0.00%	5 Missing ⚠️
...va/tech/ydb/topic/description/SupportedCodecs.java	0.00%	3 Missing ⚠️
... and 3 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #332      +/-   ##
============================================
- Coverage     47.61%   47.32%   -0.29%     
  Complexity     1750     1750              
============================================
  Files           305      309       +4     
  Lines         12392    12467      +75     
  Branches       1237     1234       -3     
============================================
  Hits           5900     5900              
- Misses         6032     6107      +75     
  Partials        460      460              

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