Add pagination to device credentials

[fionnulak]

Changes

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

Added two pagination parameters to the /v3/management/device-credentials get method.

References

This is in relation to #299

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

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

[jimmyjames]

Thanks for the PR! We should add support for the pagination params to the device credentials GET method. However, I think as currently implemented in this PR, it could be a breaking change for existing function calls using positional parameters.