- distribute ratchet keys at both community and channel levels
- use explicit `HashRatchetGroupID` in ecryption layer, instead of
inheriting `groupID` from `CommunityID`
- populate `HashRatchetGroupID` with `CommunityID+ChannelID` for
channels, and `CommunityID` for whole community
- hydrate channels with members; channel members are now subset of
community members
- include channel permissions in periodic permissions check
closes: status-im/status-desktop#10998
367b7722d1