Added empty serializer classes to fix schema generation

[EvilPug]

• Added empty serializer classes
• Fixed a typo: SingupRequestView -> SignupRequestView

Fixes:
#816

[haxoza]

Thank you for submitting this PR!

Overall looks good and it probably works in the use case mentioned in #816.

However I'm not sure if in case of Webauthn views there should be set actual serializer classes used in the code - instead of empty ones.

[tomwojcik]

APIView doesn't really have serializer_class attribute, but that's the approach that's already used in other views as well, so I guess it's fine for now.

I've created this discussion. Feel free to share your feedback.

#818

Thanks for contributing! Only small nitpicks to address.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (release/2.2.3@9bf2c65). Click here to learn what that means.

Additional details and impacted files

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##             release/2.2.3     #817   +/-   ##
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[tomwojcik]

Thank you! Sorry it took so long.