Add request to HttpResponseInfo.kt

[kikoveiga]

What does this PR do?

Add a request property to HttpResponseInfo.

Motivation

Needed by #3338 to extract headers from the actual on-wire request, which contains all the headers after the chains.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[chatgpt-codex-connector]

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Reviewed commit: c7fc91bca6

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 66.66667% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.01%. Comparing base (261867c) to head (d167cb0).

Files with missing lines	Patch %	Lines
...g/android/cronet/internal/CronetRequestCallback.kt	50.00%	0 Missing and 5 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3382      +/-   ##
===========================================
- Coverage    72.04%   72.01%   -0.03%     
===========================================
  Files          959      959              
  Lines        35351    35358       +7     
  Branches      5864     5865       +1     
===========================================
- Hits         25468    25463       -5     
- Misses        8275     8280       +5     
- Partials      1608     1615       +7     

Files with missing lines	Coverage Δ
.../android/cronet/internal/CronetHttpResponseInfo.kt	83.33% <100.00%> (+1.52%)	⬆️
...onet/internal/CronetRequestFinishedInfoListener.kt	91.67% <100.00%> (ø)
...adog/android/okhttp/internal/OkHttpResponseInfo.kt	91.18% <100.00%> (+0.27%)	⬆️
...g/android/cronet/internal/CronetRequestCallback.kt	85.00% <50.00%> (-2.27%)	⬇️

... and 38 files with indirect coverage changes

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