Fix types in server-side withPageAuthRequired

[Widcket]

Description

This PR changes the type definitions of GetServerSidePropsResultWithSession and WithPageAuthRequiredOptions to take the props type as a generic parameter, instead of relying on [key: string]: any; for typing properties other than user. Consequently, PageRoute and WithPageAuthRequired were modified as well to pass P through.

References

Fixes #309

Testing

This is merely a change in the type definitions, so no unit tests were added.

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not main

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