✨ Maintain basic messaging websocket

lib/providers/chat.dart

@@ -0,0 +1,29 @@
+import 'dart:async';
+
+import 'package:solian/providers/auth.dart';
+import 'package:solian/utils/service_url.dart';
+import 'package:web_socket_channel/web_socket_channel.dart';
+
+class ChatProvider {
+  bool isOpened = false;
+
+  Future<WebSocketChannel?> connect(AuthProvider auth) async {
+    if (auth.client == null) await auth.pickClient();
+    if (!await auth.isAuthorized()) return null;
+
+    await auth.refreshToken();
+
+    var ori = getRequestUri('messaging', '/api/unified');
+    var uri = Uri(
+      scheme: ori.scheme.replaceFirst('http', 'ws'),
+      host: ori.host,
+      path: ori.path,
+      queryParameters: {'tk': Uri.encodeComponent(auth.client!.credentials.accessToken)},
+    );
+
+    final channel = WebSocketChannel.connect(uri);
+    await channel.ready;
+
+    return channel;
+  }
+}