Improvements to PreCommit

[Gupta-Anubhav12]

Can we add Mypy Precommit for static type checking ,
pydocstyle for numpy style documentation

[samanyougarg]

We already have a mypy config in the root folder but earlier we had decided to remove it from the pre-commit as it was giving a lot of errors at that time.
We can re-enable it now since most of the work on the core code has been done.

[samanyougarg]

@all-contributors please add @Gupta-Anubhav12 for code

[allcontributors]

@samanyougarg

I've put up a pull request to add @Gupta-Anubhav12! 🎉