Add CrewAI tools instrumentation.

[umaannamalai]

This PR adds instrumentation for CrewAI tools.

test_tools.py: This suite covers the ReAct (text) tool path, which routes tool execution through crewai.tools.tool_usage.ToolUsage.

test_tools_native.py: This suite covers the native function-calling tool path, which is the default for OpenAI, Bedrock, etc. models and bypasses ToolUsage entirely

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Max errors	Warnings	Elapsed time
✅ ACTION	actionlint	9		0		0	0.95s
✅ MARKDOWN	markdownlint	7	0	0		0	1.06s
✅ PYTHON	ruff	1106	0	0		0	1.03s
✅ PYTHON	ruff-format	1106	0	0		0	0.23s
✅ YAML	prettier	23	0	0		0	1.11s
✅ YAML	v8r	23		0		0	5.39s
✅ YAML	yamllint	23		0		0	0.73s

See detailed reports in MegaLinter artifacts

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 21.24352% with 152 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.71%. Comparing base (e3c9c1d) to head (33a98e3).

Files with missing lines	Patch %	Lines
newrelic/hooks/mlmodel_crewai.py	20.00%	145 Missing and 7 partials ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           develop-crewai    #1832      +/-   ##
==================================================
- Coverage           82.15%   81.71%   -0.44%     
==================================================
  Files                 219      220       +1     
  Lines               27301    27494     +193     
  Branches             4323     4344      +21     
==================================================
+ Hits                22429    22468      +39     
- Misses               3368     3514     +146     
- Partials             1504     1512       +8     

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