Simplified configuration of custom login URL [SDK-2264]

[Widcket]

Description

This PR makes it possible to set a custom login URL for the server-side version of withPageAuthRequired with an environment variable. This way, the developer only has to configure it once, instead of in every call site of withPageAuthRequired.

Also, the server-side version of withPageAuthRequired wasn't taking the returnTo parameter that the client-side takes. This was corrected and both versions offer the same public-facing configuration options.

References

Supercedes #253

Testing

• 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 master

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[adamjmcgrath]

Looks good 👍 Just need to figure out a different solution to that special case with the named withPageAuthRequired export