Add langchain chain instrumentation

[hmstepanek]

Overview

• Add support for langchain chains (only test for new invoke method as run will eventually be removed though instrumentation does still work for run since run calls invoke underneath).
• Add support for new Lantern vectorstore.
• Unpin scipy for sklearn latest 3.12 compatibility.
• Pin langchain tests to 3.11 and below since faiss-cpu (a dependency of langchain) is not 3.12 compatible yet.

[github-actions[bot]]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	bandit	2		0	5.72s
✅ PYTHON	black	7	0	0	1.94s
✅ PYTHON	flake8	7		0	1.19s
✅ PYTHON	isort	7	0	0	0.3s
❌ PYTHON	pylint	7		5	9.22s

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (develop-ai-limited-preview-3@ebc621f). Click here to learn what that means.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop-ai-limited-preview-3 #1016 +/- ## =============================================================== Coverage ? 79.27% =============================================================== Files ? 192 Lines ? 20648 Branches ? 3604 =============================================================== Hits ? 16369 Misses ? 3288 Partials ? 991 ```

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