Bottom Sheet to confirm DM creation (#3739)

* created the view to hold the bottom sheet

* added the sheet to the start chat screen

* switched the alert with the bottom sheet

in the room member details

* add a small delay to not always show the loader

* suggested PR changes

* pr suggestions and updated tests

ElementX/Sources/Other/Avatars.swift

@@ -76,6 +76,7 @@ enum UserAvatarSizeOnScreen {
     case knockingUserBanner
     case knockingUserList
     case mediaPreviewDetails
+    case sendInviteConfirmation
 
     var value: CGFloat {
         switch self {
@@ -113,6 +114,8 @@ enum UserAvatarSizeOnScreen {
             return 52
         case .mediaPreviewDetails:
             return 32
+        case .sendInviteConfirmation:
+            return 64
         }
     }
 }