add thread flag for only notifying mentiongs

SessionMessagingKit/Threads/TSGroupThread.h

@@ -18,6 +18,7 @@ extern NSString *const TSGroupThread_NotificationKey_UniqueId;
 @property (nonatomic, strong) TSGroupModel *groupModel;
 @property (nonatomic, readonly) BOOL isOpenGroup;
 @property (nonatomic, readonly) BOOL isClosedGroup;
+@property (nonatomic) BOOL isOnlyNotifyMentions;
 
 + (instancetype)getOrCreateThreadWithGroupModel:(TSGroupModel *)groupModel;
 + (instancetype)getOrCreateThreadWithGroupModel:(TSGroupModel *)groupModel

SignalUtilitiesKit/Messaging/ThreadViewModel.swift

@@ -14,6 +14,7 @@ public class ThreadViewModel: NSObject {
     @objc public let contactSessionID: String?
     @objc public let name: String
     @objc public let isMuted: Bool
+    @objc public let isOnlyNotifyMentions: Bool
 
     var isContactThread: Bool {
         return !isGroupThread
@@ -40,6 +41,12 @@ public class ThreadViewModel: NSObject {
             self.contactSessionID = nil
         }
         
+        if let groupThread = thread as? TSGroupThread {
+            self.isOnlyNotifyMentions = groupThread.isOnlyNotifyMentions
+        } else {
+            self.isOnlyNotifyMentions = false
+        }
+
         self.unreadCount = thread.unreadMessageCount(transaction: transaction)
         self.hasUnreadMessages = unreadCount > 0
     }