Use the room heroes when computing a DM avatar. (#2900)

* Use room heroes for DM avatar content ID.

* Use RoomAvatar.heroes for the DM Details stack.

ElementX/Sources/Services/Users/UserProfileProxy.swift

@@ -28,12 +28,24 @@ struct UserProfileProxy: Equatable, Hashable {
         self.avatarURL = avatarURL
     }
     
+    init(member: RoomMemberDetails) {
+        userID = member.id
+        displayName = member.isBanned ? nil : member.name
+        avatarURL = member.isBanned ? nil : member.avatarURL
+    }
+    
     init(sdkUserProfile: MatrixRustSDK.UserProfile) {
         userID = sdkUserProfile.userId
         displayName = sdkUserProfile.displayName
         avatarURL = sdkUserProfile.avatarUrl.flatMap(URL.init(string:))
     }
     
+    init(sdkRoomHero: MatrixRustSDK.RoomHero) {
+        userID = sdkRoomHero.userId
+        displayName = sdkRoomHero.displayName
+        avatarURL = sdkRoomHero.avatarUrl.flatMap(URL.init(string:))
+    }
+    
     /// A user is meant to be "verified" when the GET profile returns back either the display name or the avatar
     /// If isn't we aren't sure that the related matrix id really exists.
     var isVerified: Bool {