Support LangChain tools

[aniketmaurya]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Users can use LangChain tools with LitAI

from langchain_core.tools import tool as langchain_tool
from litai import LLM


@langchain_tool
def get_weather(city: str) -> str:
    """Get the weather of a given city"""
    return f"Weather in {city} is sunny."

llm = LLM("openai/gpt-4")
llm.chat("What's the weather in Tokyo?", tools=[get_weather])

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in GitHub issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

❌ Patch coverage is 96.87500% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 88%. Comparing base (1f08769) to head (194d4ce).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@        Coverage Diff         @@
##           main   #24   +/-   ##
==================================
+ Coverage    88%   88%   +1%     
==================================
  Files         6     6           
  Lines       333   364   +31     
==================================
+ Hits        292   322   +30     
- Misses       41    42    +1     

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