TT-4463: Java add search-by-metadata-pair on list-messages

[googsvg]

Summary

• Adds metadata_pair query parameter support to ListMessagesQueryParams and its Builder, matching the existing pattern from ListEventQueryParams
• Fixes Support search by "metadata_pair" on ListMessagesQueryParams #268

Changes

• ListMessagesQueryParams: new optional metadataPair: Map<String, String>? field (null by default — fully backward compatible)
• MessagesTests: added test covering metadata_pair query param passthrough

Test plan

• All 377 existing tests pass
• New test: listing messages with metadata_pair calls requests with the correct params
• Clean build successful

License

I confirm that this contribution is made under the terms of the MIT license and that I have the authority necessary to make this contribution on behalf of its copyright owner.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.49%. Comparing base (18a9e9f) to head (11284c5).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #319   +/-   ##
=========================================
  Coverage     82.49%   82.49%           
  Complexity      358      358           
=========================================
  Files            38       38           
  Lines          1034     1034           
  Branches         95       95           
=========================================
  Hits            853      853           
  Misses          122      122           
  Partials         59       59           

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