Add LLM metadata support.

[umaannamalai]

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[github-actions[bot]]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	bandit	3		0	6.2s
✅ PYTHON	black	19	0	0	2.64s
✅ PYTHON	flake8	19		0	1.39s
✅ PYTHON	isort	19	0	0	0.34s
✅ PYTHON	pylint	19		0	10.52s

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.14815% with 1 lines in your changes are missing coverage. Please review.

:exclamation: No coverage uploaded for pull request base (develop-ai-limited-preview-3@3d0a4bb). Click here to learn what that means.

Files	Patch %	Lines
newrelic/hooks/mlmodel_langchain.py	96.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop-ai-limited-preview-3 #1075 +/- ## =============================================================== Coverage ? 81.64% =============================================================== Files ? 192 Lines ? 21155 Branches ? 3702 =============================================================== Hits ? 17272 Misses ? 2821 Partials ? 1062 ```

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