🧱 Add basis of tencent rtc

lib/services/rtc.dart

@@ -0,0 +1,51 @@
+import 'package:dio/dio.dart';
+import 'package:island/models/chat.dart';
+import 'package:island/models/user.dart';
+import 'package:tencent_rtc_sdk/trtc_cloud.dart';
+import 'package:tencent_rtc_sdk/trtc_cloud_def.dart';
+import 'package:tencent_rtc_sdk/trtc_cloud_listener.dart';
+
+Future<TRTCCloud> _getTRTCCloud() async {
+  return TRTCCloud.sharedInstance();
+}
+
+bool currentlyJoined = false;
+
+Future<void> joinRealtimeChat(
+  Dio apiClient,
+  SnChatRoom chat,
+  SnAccount user,
+) async {
+  final resp = await apiClient.get('/chat/realtime/${chat.id}');
+  final data = ChatRealtimeJoinResponse.fromJson(resp.data);
+  final config = data.config;
+  final cloud = await _getTRTCCloud();
+  cloud.setConsoleEnabled(true);
+  cloud.registerListener(
+    TRTCCloudListener(
+      onRemoteUserEnterRoom: (userId) {
+        print('onRemoteUserEnterRoom: $userId');
+      },
+      onRemoteUserLeaveRoom: (userId, reason) {
+        print('onRemoteUserLeaveRoom: $userId, $reason');
+      },
+    ),
+  );
+  cloud.enterRoom(
+    TRTCParams(
+      sdkAppId: config['app_id'],
+      userId: user.name,
+      userSig: data.token,
+      roomId: chat.id,
+      role: TRTCRoleType.anchor,
+    ),
+    TRTCAppScene.voiceChatRoom,
+  );
+  cloud.startLocalAudio(TRTCAudioQuality.speech);
+  currentlyJoined = true;
+}
+
+Future<void> leaveRealtimeChat(SnChatRoom chat) async {
+  final cloud = await _getTRTCCloud();
+  cloud.exitRoom();
+}