feat: Auto chip when command entered

lib/src/message_input.dart

@@ -290,9 +290,25 @@ class MessageInputState extends State<MessageInput> {
                     _mentionsOverlay = null;
 
                     if (s.startsWith('/')) {
+                      var matchedCommandsList = StreamChannel.of(context)
+                          .channel
+                          .config
+                          .commands.where((element) => element.name == s.substring(1)).toList();
+
+                      if(matchedCommandsList.length == 1) {
+                        _chosenCommand = matchedCommandsList[0];
+                        textEditingController.clear();
+                        _typingStarted = false;
+                        setState(() {
+                          _commandEnabled = true;
+                        });
+                        _commandsOverlay.remove();
+                        _commandsOverlay = null;
+                      } else {
                         _commandsOverlay = _buildCommandsOverlayEntry();
                         Overlay.of(context).insert(_commandsOverlay);
                       }
+                    }
 
                     if (textEditingController.selection.isCollapsed &&
                         (s[textEditingController.selection.start - 1] == '@' ||
@@ -440,12 +456,14 @@ class MessageInputState extends State<MessageInput> {
                 padding: const EdgeInsets.all(0),
                 shrinkWrap: true,
                 children: [
+                  if (commands.isNotEmpty)
                     Padding(
                       padding: const EdgeInsets.only(left: 8.0, top: 8.0),
                       child: Row(
                         children: [
                           Padding(
-                          padding: const EdgeInsets.symmetric(horizontal: 8.0),
+                            padding:
+                                const EdgeInsets.symmetric(horizontal: 8.0),
                             child: Icon(StreamIcons.lightning,
                                 color: StreamChatTheme.of(context).accentColor),
                           ),