Populate a user's OAuthGroups using Microsoft Graph memberOf endpoint

[Fatiz]

Given the current implementation is using: "https://graph.microsoft.com/v1.0/me" I figured it might be easy enough to add in group support since we are given the UserID.

Haphazardly tested plugging the same logic into the generic provider and confirmed to get the OAuthGroups field populated.
(real info replaced)

2025-08-24T02:58:04Z DBG Provider is not username
2025-08-24T02:58:04Z DBG Provider exists
2025-08-24T02:58:04Z DBG Email is whitelisted
2025-08-24T02:58:04Z DBG Authenticated userContext={"Email":"example@example.com","IsLoggedIn":true,"Name":"John Doe","OAuth":true,"OAuthGroups":"Apple,Long Group Name,Testing,Dog_users,All Users,JM_Users,TEST-Internal,Chicken-General,Software,Foo-All-Users,Foo_Bar4","Provider":"generic","TotpEnabled":false,"TotpPending":false,"Username":"John.Doe"}
2025-08-24T02:58:04Z INF Request address=172.18.0.7:55754 latency="367.273µs" method=GET path=/api/user status=200
2025-08-24T02:58:04Z INF Request address=172.18.0.7:55754 latency="711.567µs" method=GET path=/background.jpg status=200

Let me know your thoughts! 😄
I can test using this branch later the week.

[Fatiz]

@need4swede Any thoughts on this? There's probably better ways, but would this be something that you think would be worthwhile putting into the PR @ tinyauthapp#304?

Additionally, it could maybe be made optional for people who don't care about groups. That way, folks won't need GroupMember.Read.All if they are not looking for the group functionality

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