Please add Grants to Management Client

[mharrisn]

Checklist

• I have looked into the Readme and have not found a suitable solution or answer.
• I have looked into the API documentation and have not found a suitable solution or answer.
• I have searched the issues and have not found a suitable solution or answer.
• I have searched the Auth0 Community forums and have not found a suitable solution or answer.
• I agree to the terms within the Auth0 Code of Conduct.

Describe the problem you'd like to have solved

The methods of the /Grants endpoint are currently not part of the SDK. Please add them so that the .Net SDK is closer to parity with the REST API.

Describe the ideal solution

A GrantsClient is added to the SDK with a treatment similar to the existing SDK.

Alternatives and current workarounds

Call the REST API directly instead: https://auth0.com/docs/api/management/v2#!/Grants/get_grants

Additional context

No response

[frederikprijck]

Thanks, I opened a PR to add them.