python-lint (#14689)

# Description: _python-lint_

This agent writes Python code that is formatted and linted using
`black`, `ruff`, and `mypy`, but does not execute the code. It writes
the code to a temporary file and then runs the linters. Once these
checks pass, the code is returned.

# Dependencies

- black
- ruff
- mypy

# Demo

The functionality can be seen here:
https://huggingface.co/spaces/joshuasundance/langchain-streamlit-demo

templates/python-lint/python_lint/__init__.py

@@ -0,0 +1,3 @@
+from python_lint.agent_executor import agent_executor
+
+__all__ = ["agent_executor"]