Adding MyPy

[NickGeneva]

Earth-2 MIP Pull Request

Description

Just enables mypy with pre-commit, make file and pyproject toml. Getting all files up to standard will take much more work and can be done iteratively. Any new files going forward will need to pass mypy.

Closes: https://github.com/NVIDIA/earth2mip/issues/52

Checklist

• [x] I am familiar with the Contributing Guidelines.
• [x] New or existing tests cover these changes.
• [x] The documentation is up to date with these changes.
• [x] The CHANGELOG.md is up to date with these changes.
• [x] An issue is linked to this pull request.

Dependencies

[NickGeneva]

/blossom-ci

[YichengDWu]

I propose adding a badge for mypy.