Autogen LLMStreamProxy Updates

[TimPansino]

Overview

• Rename GeneratorProxy and AsyncGeneratorProxy to LLMStreamProxy for clarity and to differentiate from the existing transaction wrappers with the same name.
• Add test suite for LLMStreamProxy.
• Optimize implementation of LLMStreamProxy by removing unnecessary transaction lookups.
• Add streaming tests for Autogen.
• Add streaming reporting for Autogen even if the stream wasn't fully exhausted after the Response object.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	7		0	0	1.02s
✅ MARKDOWN	markdownlint	7	0	0	0	1.34s
✅ PYTHON	ruff	1037	0	0	0	1.18s
✅ PYTHON	ruff-format	1037	0	0	0	0.43s
✅ YAML	prettier	15	0	0	0	1.62s
✅ YAML	v8r	15		0	0	6.11s
✅ YAML	yamllint	15		0	0	0.67s

See detailed reports in MegaLinter artifacts

[codecov-commenter]

Codecov Report

❌ Patch coverage is 77.92208% with 34 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.84%. Comparing base (983474f) to head (1f30027).

Files with missing lines	Patch %	Lines
newrelic/hooks/mlmodel_autogen.py	76.82%	11 Missing and 8 partials ⚠️
newrelic/common/llm_utils.py	71.15%	4 Missing and 11 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1671      +/-   ##
==========================================
- Coverage   81.88%   81.84%   -0.05%     
==========================================
  Files         215      215              
  Lines       25861    25959      +98     
  Branches     4108     4127      +19     
==========================================
+ Hits        21177    21246      +69     
- Misses       3303     3315      +12     
- Partials     1381     1398      +17     

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