Added support for Session & Refresh token in management api client

[gyaneshgouraw-okta]

Changes

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

• Added support for sessions-manager & refresh-tokens-manager

References

Please include relevant links supporting this change such as a:

• Auth0 Docs
  • Session API
  • Refresh Token API

Change verification

• Verified the changes with a basic nodeJs app, by updating auth0/dist to latest built version on local machine
• Verified both sessions-manager & refresh-tokens-manager get methods

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
• [x] This change adds integration test coverage

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