Support for OpenAI's .with_raw_response.

[lrafeei]

This PR adds support for .with_raw_response. prepending to HTTP method calls in OpenAI.

Currently, the New Relic instrumentation will instrument this, but during the collection of custom AI event attributes, this modified response type (LegacyAPIResponse) will result in a crash.

This is part 1 of two PRs. The second part will cover the streaming version of this functionality, .with_streaming_response.

[github-actions]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	bandit	1		0	5.71s
✅ PYTHON	black	7	1	0	2.4s
✅ PYTHON	flake8	7		0	0.84s
✅ PYTHON	isort	7	1	0	0.23s
❌ PYTHON	pylint	7		31	6.0s

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Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 81.66%. Comparing base (2ab12c5) to head (77bd146).

Files	Patch %	Lines
newrelic/hooks/mlmodel_openai.py	81.81%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1138      +/-   ##
==========================================
- Coverage   81.67%   81.66%   -0.02%     
==========================================
  Files         193      193              
  Lines       21334    21341       +7     
  Branches     3717     3721       +4     
==========================================
+ Hits        17425    17428       +3     
+ Misses       2826     2825       -1     
- Partials     1083     1088       +5     

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[hmstepanek]

Just had one requested change to the implementation otherwise looks good.

[hmstepanek]

I tested it manually and things show up in the UI. Couple additional fixes but after that I think we're good to merge this one.