Implement HTTP/2 IDLE based eviction

[TharmiganK]

Purpose

Fixes: ballerina-platform/ballerina-library#7309

Before this implementation: https://github.com/TharmiganK/ballerina-http-performance-tests/actions/runs/13367157572
After this implementation: https://github.com/TharmiganK/ballerina-http-performance-tests/actions/runs/13367166344

Examples

Refer to the attached issue

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility
• Checked the impact on OpenAPI generation

[codecov]

Codecov Report

Attention: Patch coverage is 90.69767% with 4 lines in your changes missing coverage. Please review.

Project coverage is 79.94%. Comparing base (252293a) to head (8ece332).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...tractimpl/sender/http2/Http2ConnectionManager.java	89.18%	2 Missing and 2 partials ⚠️

❌ Your project check has failed because the head coverage (79.94%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2277      +/-   ##
============================================
+ Coverage     79.91%   79.94%   +0.02%     
  Complexity      678      678              
============================================
  Files           418      418              
  Lines         23124    23157      +33     
  Branches       3753     3757       +4     
============================================
+ Hits          18480    18513      +33     
  Misses         3512     3512              
  Partials       1132     1132              

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[TharmiganK]

Closing this for now, until we do a perf test with the changes

[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud