Llm response token counts

[umaannamalai]

This PR includes changes to send token counts pulled from LLM response objects directly from the agent.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	8		0	0	1.05s
✅ MARKDOWN	markdownlint	7	0	0	0	1.45s
✅ PYTHON	ruff	1030	0	0	0	1.11s
✅ PYTHON	ruff-format	1030	0	0	0	0.41s
✅ YAML	prettier	19	0	0	0	1.66s
✅ YAML	v8r	19		0	0	6.29s
✅ YAML	yamllint	19		0	0	0.75s

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 90.32258% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.92%. Comparing base (7343f58) to head (35c85ad).

Files with missing lines	Patch %	Lines
newrelic/hooks/mlmodel_gemini.py	67.39%	7 Missing and 8 partials ⚠️
newrelic/hooks/external_botocore.py	97.32%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1682      +/-   ##
==========================================
+ Coverage   81.85%   81.92%   +0.07%     
==========================================
  Files         214      214              
  Lines       25683    25813     +130     
  Branches     4076     4090      +14     
==========================================
+ Hits        21022    21147     +125     
- Misses       3264     3265       +1     
- Partials     1397     1401       +4     

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