Some typing improvements, add py.typed

[micimize]

Description

• Improves some method typing for the MinigridEnv api and elsewhere.
• Adds a py.typed marker so that tooling like mypy will know to use minigrid's type annotations.
• Changed name in setup.py to minigrid

I did not find a CONTRIBUTING.md but did pre-commit and ensured all tests pass.

Type of change

Please delete options that are not relevant.

• [X] New feature (non-breaking change which adds functionality)

Checklist:

• [X] I have run the pre-commit checks with pre-commit run --all-files
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [X] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [X] New and existing unit tests pass locally with my changes

[micimize]

@pseudo-rnd-thoughts ok – I've added an --add-import to isort along with autoflake to remove the leftover imports, and changed the ordering to reduce the need for re-running pre-commit (pyupgrade removes need for imports, removing imports effects isort ordering)

I have only really just started using it for my project – some details here: https://github.com/Farama-Foundation/Minigrid/issues/168#issuecomment-1307849050. But would be happy to join the discord – can you resend an invite? It became invalid when discord tried to make me a new account :/

[pseudo-rnd-thoughts]

Thanks for the changes, here is a new link https://discord.gg/N8CwYyGt Could you revert the setup name then we can merge