Improve type hinting of or_

[ProfDoof]

Summary

The type hinting for the or_ function presumes that all validators used have the same input type though that is not a requirement. This adds several overloads and a fall-through Any type catch-all to the or_ function that will help satisfy the type check.

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[ProfDoof]

I believe that I need to add some mypy tests to adequately verify that or_ works the way that I believe it does. However, it's unclear where I should add that.

[hynek]

I believe that I need to add some mypy tests to adequately verify that or_ works the way that I believe it does. However, it's unclear where I should add that.

That would go to tests/typing_example.py – just exercise the types (it doesn't have to be runnable) – thanks!