feat: Password support for /e/authorize endpoint

[pmathew92]

Changes

This PR adds the support for ROPG in the /e/authorize endpoint. On successful verification the auth0-server returns an authorization code which is exchanged for a valid set of Credentials.

Testing

Please describe how this can be tested by reviewers. Be specific about anything not tested and reasons why. Since this library has unit 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 or why not

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

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