Feature Request: Allow groups to be added and removed for external users.

[iamsid]

As identified in #150, users added via external provider (OAuth2, OID) are given access only to default groups.
There is no way to modify that access right now. Please add an option to manage groups for external users, same as local users.. either via the external platform or via yaade.

[jonrosner]

you can add groups via the external system. The configuration fields section provides you with two configuration options:

1. fields/groups which is a JSON Path to your groups in the received user info token.
2. fields/filter is a regex that lets you filter those groups.

managing an external user's groups from within Yaade would be possible. I'll investigate this further.