chore: add static analysis for Python templates

[vdusek]

Add static analysis (Ruff, Mypy) for Python templates.

Edit: Mypy will require further updates due to our usage of src/:

$ make type-check 
poetry run mypy
templates/python-crawlee-beautifulsoup/src/__init__.py: error: Duplicate module named "src" (also at "templates/python-beautifulsoup/src/__init__.py")
templates/python-crawlee-beautifulsoup/src/__init__.py: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#mapping-file-paths-to-modules for more info
templates/python-crawlee-beautifulsoup/src/__init__.py: note: Common resolutions include: a) using `--exclude` to avoid checking one of them, b) adding `__init__.py` somewhere, c) using `--explicit-package-bases` or adjusting MYPYPATH
Found 1 error in 1 file (errors prevented further checking)
make: *** [Makefile:16: type-check] Error 2

This will be addressed later in #317.

[vdusek]

@jirispilka, @MQ37 feel free to check this out as well 🙂