remove(types)!: remove members from CreateGroup

Now a group can only be created with the creator as the only initial
member. This forbids group creator from adding other members without
their consent. Additional members can join the group later at their own
will.

blah-types/src/lib.rs

@@ -353,9 +353,6 @@ pub enum CreateRoomPayload {
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct CreateGroup {
     pub attrs: RoomAttrs,
-    /// The initial member list. Besides invariants of `RoomMemberList`, this also must include the
-    /// room creator themselves, with the highest permission (-1).
-    pub members: RoomMemberList,
     pub title: String,
 }