add Topic.DescribeTopicConsumer

[qrort]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

It is impossible to get detailed topic consumer information. in YDB CLI, there is topic consumer describe method that allows user to get read/write lag timings, amount of read bytes per customer ets.

Issue Number: N/A

What is the new behavior?

Topic client got DescribeTopicConsumer method that performs corresponding GRPC call to YDB and returns the data with minimal modification.

Other information

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 57.06522% with 79 lines in your changes missing coverage. Please review.

Project coverage is 66.99%. Comparing base (84a2b9b) to head (6503633).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/grpcwrapper/rawtopic/describe_consumer.go	40.84%	36 Missing and 6 partials ⚠️
internal/topic/topicclientinternal/client.go	60.00%	12 Missing and 2 partials ⚠️
internal/grpcwrapper/rawtopic/client.go	23.52%	12 Missing and 1 partial ⚠️
internal/grpcwrapper/rawoptional/rawoptional.go	52.63%	9 Missing ⚠️
topic/topicoptions/topicoptions_describe.go	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1508      +/-   ##
==========================================
- Coverage   67.07%   66.99%   -0.08%     
==========================================
  Files         353      355       +2     
  Lines       36825    37006     +181     
==========================================
+ Hits        24700    24792      +92     
- Misses      11033    11110      +77     
- Partials     1092     1104      +12     

Flag	Coverage Δ
experiment	71.13% <66.22%> (-0.19%)	⬇️
go-1.21.x	67.21% <59.41%> (-0.14%)	⬇️
go-1.22.x	64.90% <57.06%> (-0.16%)	⬇️
go-1.23.x	66.94% <57.06%> (-0.12%)	⬇️
integration	53.40% <64.90%> (-0.04%)	⬇️
macOS	40.74% <27.15%> (-0.08%)	⬇️
ubuntu	71.32% <66.22%> (-0.07%)	⬇️
unit	41.16% <25.00%> (-0.10%)	⬇️
windows	41.16% <25.00%> (-0.09%)	⬇️
ydb-23.3	48.84% <64.90%> (-0.09%)	⬇️
ydb-24.1	53.31% <64.90%> (-0.03%)	⬇️
ydb-24.2	52.98% <64.90%> (-0.39%)	⬇️
ydb-nightly	71.13% <66.22%> (-0.19%)	⬇️

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