New Feature: Signup Success Event

[fostergn]

Changes

Please describe both what is changing and why this is important. Include:

• adding "signup success" event

References

Please include relevant links supporting this change such as a:

n/a

Please note any links that are not publicly accessible.

Testing

Please describe how this can be tested by reviewers. Be specific about anything not tested and reasons why. If this library has unit and/or integration testing, tests should be added for new functionality and existing tests should complete without errors.

• This change adds unit test coverage
• This change adds integration test coverage
• This change has been tested on the latest version of the platform/language

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All existing and new tests complete without errors
• All code quality tools/guidelines have been run/followed
• All relevant assets have been compiled
• All active GitHub checks have passed

[fostergn]

I'm new to contributing to this project and was looking for an existing test to base my own tests on. I didn't see an existing test for an event like signup_failed thought

[stevehobbsdev]

Thanks for your contribution, @fostergn!