member_roles endpoint is not implemented

[Nivalam]

The member_roles enpoint is not implemented in python-gitlab : https://docs.gitlab.com/16.8/ee/api/member_roles.html

We can't add a gitlab custom roles with the library

[Nejc Habjan]

Thanks for the report @Nivalam. Would be great if someone who uses GitLab Ultimate could contribute this so adding help wanted here 🙇

[Nivalam]

I would be happy to test if someone implement this