Add user session management API calls

[wjohnstondrip]

Changes

Adding support for user sessions endpoints.

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.

• [X] This change adds unit test coverage
• [ ] This change adds integration test coverage
• [ ] This change has been tested on the latest version of Ruby

Checklist

• [X] I have read the Auth0 general contribution guidelines
• [X] I have read the Auth0 Code of Conduct
• [X] All existing and new tests complete without errors
• [ ] Rubocop passes on all added/modified files
• [ ] All active GitHub checks have passed

[stevehobbsdev]

Thanks for your patience here @wjohnstondrip - looks good to me!