Add MCP Instrumentation

[umaannamalai]

This PR adds instrumentation for MCP prompts, tools, and resources.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ MARKDOWN	markdownlint	7	0	0	0	0.97s
✅ MARKDOWN	markdown-link-check	7		0	0	22.01s
✅ PYTHON	ruff	907	0	0	0	0.92s
✅ PYTHON	ruff-format	907	0	0	0	0.25s
✅ YAML	prettier	13	0	0	0	1.25s
✅ YAML	v8r	13		0	0	7.05s
✅ YAML	yamllint	13		0	0	0.58s

See detailed report in MegaLinter reports

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.47059% with 12 lines in your changes missing coverage. Please review.

Project coverage is 81.49%. Comparing base (a311b33) to head (e41c7e1).
Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
newrelic/hooks/adapter_mcp.py	76.00%	5 Missing and 7 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1403      +/-   ##
==========================================
+ Coverage   81.29%   81.49%   +0.19%     
==========================================
  Files         204      205       +1     
  Lines       23212    23263      +51     
  Branches     3668     3675       +7     
==========================================
+ Hits        18871    18958      +87     
+ Misses       3119     3072      -47     
- Partials     1222     1233      +11     

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