Room mentioning in the composer (#3868)

* refactored the suggestion item structure

to scale with the room pill

* Implemented a way for the rooms

to appear in the suggestions view for the RTE, however I need to add the pills to the composer and the compatibility with the plain text composer

* small code correction

* fix

* fixed a bug where the suggestion wasn't returning

the right suggestion type and the suggestion text properly

* implementation done!

also updated some tests, but we need more of them

* updated toolbar view model tests

* updated tests

* updated preview tests

* renamed the Avatars case for the suggestions

ElementX/Sources/Other/Avatars.swift

@@ -70,7 +70,7 @@ enum UserAvatarSizeOnScreen {
     case readReceipt
     case readReceiptSheet
     case editUserDetails
-    case suggestions
+    case completionSuggestions
     case blockedUsers
     case knockingUsersBannerStack
     case knockingUserBanner
@@ -89,7 +89,7 @@ enum UserAvatarSizeOnScreen {
             return 32
         case .home:
             return 32
-        case .suggestions:
+        case .completionSuggestions:
             return 32
         case .blockedUsers:
             return 32
@@ -133,6 +133,7 @@ enum RoomAvatarSizeOnScreen {
     case notificationSettings
     case roomDirectorySearch
     case joinRoom
+    case completionSuggestions
 
     var value: CGFloat {
         switch self {
@@ -142,6 +143,8 @@ enum RoomAvatarSizeOnScreen {
             return 32
         case .roomDirectorySearch:
             return 32
+        case .completionSuggestions:
+            return 32
         case .messageForwarding:
             return 36
         case .globalSearch: