Merge WriteThroughput metric support

[zoewangg]

Motivation and Context

This PR adds a WRITE_THROUGHPUT metric to measure request body upload speed (bytes/sec), complementing the existing READ_THROUGHPUT metric. The implementation tracks timing from when the first byte is read from the request body stream to when the last byte is read. Fixes #3704

The changes have been reviewed and approved in #6688 and #6698 except the ones from the last commit.

Modifications

• Added WRITE_THROUGHPUT metric to CoreMetric class
• Implemented BytesWrittenTrackingInputStream for sync clients to track bytes read from request body stream
• Implemented BytesWrittenTrackingPublisher for async clients with TCK compliance
• Added RequestBodyMetrics container class to hold timing and byte count data
• Integrated tracking into MakeHttpRequestStage (sync) and MakeAsyncHttpRequestStage (async)
• Report metric in HandleResponseStage (sync) and AsyncApiCallAttemptMetricCollectionStage (async)
• Added design documentation in docs/design/core/metrics/writeThroughput/

Testing

• Unit tests for BytesWrittenTrackingInputStream and BytesWrittenTrackingPublisher
• TCK verification test for BytesWrittenTrackingPublisher
• Functional tests for sync and async clients (SyncWriteThroughputMetricTest, AsyncWriteThroughputMetricTest)
• Integration tests in PutObjectIntegrationTest for S3 sync and async clients

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed
• I have added a changelog entry. Adding a new entry must be accomplished by running the scripts/new-change script and following the instructions. Commit the new file created
  by the script in .changes/next-release with your changes.
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• I confirm that this pull request can be released under the Apache 2 license

[sonarqubecloud]

Quality Gate passed

Issues
44 New issues
0 Accepted issues

Measures
0 Security Hotspots
96.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

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