Changes for crew refactor

[bboynton97]

Crew recently switched from using Langchain to LiteLLM. This adds support for that change.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
agentops/__init__.py	33.33%	4 Missing ⚠️

Flag	Coverage Δ
unittests	44.40% <33.33%> (-0.01%)	⬇️

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Files with missing lines	Coverage Δ
agentops/__init__.py	46.87% <33.33%> (-0.38%)	⬇️