Added support of YDB custom headers

[alex268]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 92.59259% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.97%. Comparing base (2a93699) to head (80a976e).

Files with missing lines	Patch %	Lines
...a/tech/ydb/core/impl/pool/NettyChannelFactory.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #580      +/-   ##
============================================
- Coverage     62.98%   62.97%   -0.02%     
- Complexity     2468     2471       +3     
============================================
  Files           333      333              
  Lines         13980    13992      +12     
  Branches       1416     1418       +2     
============================================
+ Hits           8806     8812       +6     
- Misses         4523     4528       +5     
- Partials        651      652       +1     

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[Copilot]

Pull request overview

This pull request adds support for custom YDB headers (x-ydb-application-name and x-ydb-client-pid) to enable better tracking and identification of client applications. The implementation refactors metadata interceptor creation into a centralized utility method.

Changes:

• Added two new optional custom headers: APPLICATION_NAME and CLIENT_PROCESS_ID to the YdbHeaders class
• Refactored metadata interceptor creation from inline implementation in factory classes to a centralized YdbHeaders.createMetadataInterceptor() method
• Added builder methods withApplicationName() and withClientProcessId() to GrpcTransportBuilder for configuring the new headers

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
core/src/main/java/tech/ydb/core/grpc/YdbHeaders.java	Added new header constants and centralized metadata interceptor creation method
core/src/main/java/tech/ydb/core/grpc/GrpcTransportBuilder.java	Added fields, getters, and builder methods for the new custom headers
core/src/main/java/tech/ydb/core/impl/pool/NettyChannelFactory.java	Refactored to use centralized metadata interceptor creation, removed duplicate code
core/src/main/java/tech/ydb/core/impl/pool/ShadedNettyChannelFactory.java	Refactored to use centralized metadata interceptor creation, removed duplicate code
core/src/test/java/tech/ydb/core/impl/pool/DefaultChannelFactoryTest.java	Added test coverage for custom headers and updated existing tests to verify metadata

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