chore: cleanup VCS versioning

[Saransh-cpp]

Ran into a few developer issues while installing locally and decided to inspect pyproject.toml -

• hatch-vcs uses setuptools_scm underneath, so it is not required to list down setuptools_scm's config in pyproject.toml (this was redundant anyways, given that the hatch-vcs config was given preference)
• The path of the version file is automatically picked up by hatch-vcs
• The version file (_version.py) should not be tracked by version control
• setuptools_scm suggests using the name _version.py and not version.py
• version.pyi defines the structure of the version (this is optional and can be removed, but it is always nice to have one)

I hope these things were not intentional.

[lgray]

Not intentional, thanks for cleaning it up!

[lgray]

@Saransh-cpp if you're done here I'll turn on auto-merge. Please let me know either way.

[Saransh-cpp]

This should be ready to merge!