feat(auth0-auth-js): make requestExpiry and authorizationDetails params explicit

[guabu]

Description

Exposes the requestExpiry and authorizationDetails params as explicit options on BackchannelAuthenticationOptions to align with the existing loginHint and bindingMessage parameters and offer better type hints.

Previously, a developer would have to pass those parameters as part of the authorizationParams object and would be missing type information.

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 the default branch