feat: add Hijack support for WebSocket upgrades in metrics handler

[Suhaibinator]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.48%. Comparing base (2efa456) to head (f2bd869).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #106   +/-   ##
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  Coverage   97.48%   97.48%           
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  Files          18       18           
  Lines        1867     1872    +5     
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+ Hits         1820     1825    +5     
  Misses         35       35           
  Partials       12       12           

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[Copilot]

Pull request overview

This PR adds Hijack interface support to the metrics middleware's response writer wrapper to enable WebSocket upgrades and other connection hijacking scenarios to work properly through the metrics layer.

• Implements the http.Hijacker interface on the responseWriter struct
• Delegates hijack calls to the underlying ResponseWriter when supported
• Returns http.ErrNotSupported for ResponseWriters that don't support hijacking

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pkg/metrics/handler_method.go	Adds Hijack() method to responseWriter that delegates to underlying ResponseWriter when it implements http.Hijacker
pkg/metrics/metrics_test.go	Adds MockHijackResponseWriter mock and two test cases covering both successful hijack and unsupported hijack scenarios

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