Adding onBeforeAuthentication to the withAuthenticationRequired HOC

[stephenkelzer]

Description

Adds an optional onBeforeAuthentication function property to the withAuthenticationRequired HOC that is called before navigating to the Auth0 authentication screen from your application. This should not introduce any breaking changes as everything is optional (I used onRedirecting for inspiration during my implementation).

I am currently using Auth0's withAuthenticationRequired HOC and our product team wants to fire an event to our analytics provider when a user triggers the authentication process with Auth0.

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

[adamjmcgrath]

Thanks @stephenkelzer