progress on slow mode

packages/stream_chat/lib/src/client/channel.dart

@@ -130,6 +130,9 @@ class Channel {
     return state?.channelStateStream.map((cs) => cs.channel?.cooldown);
   }
 
+  ///
+  DateTime? cooldownStartedAt;
+
   /// Channel creation date
   DateTime? get createdAt {
     _checkInitialized();
@@ -429,6 +432,9 @@ class Channel {
         skipPush: skipPush,
       );
       state!.addMessage(response.message);
+      if (cooldown! > 0) {
+        cooldownStartedAt = DateTime.now();
+      }
       return response;
     } catch (e) {
       if (e is StreamChatNetworkError && e.isRetriable) {
@@ -827,6 +833,20 @@ class Channel {
     return _client.updateChannelPartial(id!, type, set: set, unset: unset);
   }
 
+  /// Enable slow mode
+  Future<UpdateChannelResponse> enableSlowMode({
+    required int cooldownInterval,
+  }) async {
+    _checkInitialized();
+    return _client.enableSlowdown(id!, type, cooldownInterval);
+  }
+
+  /// Disable slow mode
+  Future<UpdateChannelResponse> disableSlowMode() async {
+    _checkInitialized();
+    return _client.disableSlowdown(id!, type);
+  }
+
   /// Delete this channel. Messages are permanently removed.
   Future<EmptyResponse> delete() async {
     _checkInitialized();