get_all_organization_members should support fields #534

Checklist

• I have looked into the Readme and Examples, 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 endpoint for fetching all Organization members allows us to pass a fields parameter, specifically to include all member's roles in the response. The python library hides this option, and it would be much more performant to allow us to get all roles attached in one request instead of n^2 requests to fetch all users and then each user's roles in a separate request for each.

Describe the ideal solution

There are two ways it could play out, either by adding a include_roles flag, or by providing access to add more paramters via ** args to this and other functions.

Alternatives and current workarounds

The current way we have to do this is to do the following;

1. Fetch all users in an organization
2. Iterate over each user, sending a new request to fetch that user's roles specifically

Alternatively, we have been accessing variables and functions we shouldn't be, running something like;

auth0.organizations.client.get(auth0.organizations._url('<org_id>', "members"), params=dict(fields='user_id,name,email,roles'))

Additional context

No response