Add re-export of __init__ imports with __all__

[warlo]

Had this issue with mypy in strict mode and figured it could make sense for the webauthn module to expose the methods explicitly and skip the noqa: F401.

error: Module "webauthn" does not explicitly export attribute "generate_authentication_options"; implicit reexport disabled
...

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[MasterKale]

@warlo Thank you for your submission, this is great! This library is only the second Python library I've ever published to PyPI and so tricks like this one are still new to me. And this all makes mypy happy?

Things have been busy lately or I'd have responded earlier. I'll take a closer look soon and review it all properly.

[warlo]

No probs! __all__ defines what the module exports, and also makes it support from webauthn import *.
Similar case: konradhalas/dacite#133

For mypy's case I did not notice anything else, so should be good afaics 👍

[MasterKale]

@warlo Thank you for the contribution! This is going out to PyPI as we speak as webauthn==1.7.1 🚀