Add support for Mypy type hinting

[PureTryOut]

Is your feature request related to a problem? Please describe.
Our codebase is type checked using type hinting. There are stub packages for Django but graphene-django seems to be lacking it, thus importing anything from it causes Mypy to complain that error: Skipping analyzing "graphene_django": module is installed, but missing library stubs or py.typed marker [import]. It does so for just graphene as well.

Describe the solution you'd like
graphene-django to export type hints.

[ryanovas]

seconded

[ghost]

If the maintainers approve, then I can start adding types to graphene-django, and in general graphene

[50-Course]

seconded. It would seem this involve project-wide type hinting? @PureTryOut

[PureTryOut]

I'm not sure what you want me to answer? I don't know, I'm not involved in development of this project, just a user.

[50-Course]

Thank you for clarifying. I have just gone through the source code myself. Thanks for signifying :)

[firaskafri]

If the maintainers approve, then I can start adding types to graphene-django, and in general graphene

I thin its a good idea.