add support for named args

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

@@ -241,7 +241,7 @@ class Channel {
         debounce(
           timeout: Duration(seconds: 1),
           target: updateAttachment,
-          arguments: [
+          positionalArguments: [
             it.copyWith(
               uploadState: UploadState.inProgress(uploaded: sent, total: total),
             ),
@@ -1695,7 +1695,7 @@ class ChannelClientState {
     debounce(
       timeout: Duration(milliseconds: 500),
       target: _channel._client.chatPersistenceClient?.updateChannelState,
-      arguments: [v],
+      positionalArguments: [v],
     );
   }
 

packages/stream_chat/lib/src/debounce.dart

@@ -9,14 +9,19 @@ Map<Function, Timer> timeouts = {};
 void debounce({
   @required Duration timeout,
   @required Function target,
-  @required List arguments,
+  List positionalArguments,
+  Map<Symbol, dynamic> namedArguments,
 }) {
   if (timeouts.containsKey(target)) {
     timeouts[target].cancel();
   }
 
   final timer = Timer(timeout, () {
-    Function.apply(target, arguments);
+    Function.apply(
+      target,
+      positionalArguments,
+      namedArguments,
+    );
   });
 
   timeouts[target] = timer;