Add support for reading without a consumer

[pnv1]

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[codecov-commenter]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (0e20b2a) 40.23% compared to head (ace33b8) 40.20%.

Files	Patch %	Lines
...n/java/tech/ydb/topic/settings/ReaderSettings.java	0.00%	7 Missing ⚠️
...main/java/tech/ydb/topic/read/impl/ReaderImpl.java	0.00%	6 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #211      +/-   ##
=============================================
- Coverage      40.23%   40.20%   -0.04%     
  Complexity      1186     1186              
=============================================
  Files            246      246              
  Lines           9697     9706       +9     
  Branches         923      927       +4     
=============================================
  Hits            3902     3902              
- Misses          5527     5536       +9     
  Partials         268      268              

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