[Feature]: User Groups for sharing/permissions

Feature detail I'd like be able to use groups of users. Either created by the admin, users, imported from oauth, or some combination thereof. Ideally the end result would be able to use all of those options together. Admin created through local and if they control the provider oauth information, with users being able to create their own local groups. Reasoning behind this request is that all sides of my family have requested me to create a space for them to share photos with the family that isn't tied to some specific platform. Immich is far and above my top choice for this compared to other projects I have seen out there. Downside is that with my parents being divorced and then my wifes side of the family that's essentially three separate units. My mother doesn't want my father and his side of the family to see pictures of her birthday party for example. I don't want to run three instances of Immich because then photos I'd like all three family'…