ad98c9549a
- Added APIs to store, retrieve, and clone upstream response headers in context for detailed logging. - Updated `RecordAPIResponseMetadata`, `RecordAPIWebsocketHandshake`, and related methods to capture response headers. - Extended `UsageReporter` to include response headers in published usage records. - Enhanced payload tests to validate response headers' integrity and persistence. - Refactored `usage.Record` to support optional `ResponseHeaders` field.