Add max_active_partitions support to topic operations

[Eistern]

Summary

This PR introduces support for the max_active_partitions parameter in topic control plane operations, providing more precise control over partition auto-merging behavior.

Changes

Added new maxActivePartitions field and corresponding getters/setters in partitioning settings classes
Implemented support for setting and retrieving maxActivePartitions in topic client implementation
Deprecated partitionCountLimit in favor of maxActivePartitions as described in the YDB proto specifications - https://github.com/ydb-platform/ydb/blob/7b288ef1f52ea97c71014dac8ee95bbde82bd6e3/ydb/public/api/protos/ydb_topic.proto#L909

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 27.77778% with 13 lines in your changes missing coverage. Please review.

Project coverage is 58.93%. Comparing base (c91ad03) to head (5216bbd).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
.../ydb/topic/settings/AlterPartitioningSettings.java	0.00%	5 Missing ⚠️
.../tech/ydb/topic/settings/PartitioningSettings.java	44.44%	5 Missing ⚠️
...main/java/tech/ydb/topic/impl/TopicClientImpl.java	25.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #496      +/-   ##
============================================
+ Coverage     58.15%   58.93%   +0.77%     
- Complexity     2183     2220      +37     
============================================
  Files           325      327       +2     
  Lines         13216    13444     +228     
  Branches       1330     1339       +9     
============================================
+ Hits           7686     7923     +237     
+ Misses         4907     4899       -8     
+ Partials        623      622       -1     

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