feat: Using kBeatIntervalMS option for rtsp heartbeat interval time and add kRtspBeatType for setting rtsp heartbeat type

src/Common/config.cpp

@@ -361,6 +361,7 @@ static onceToken token([]() {
 namespace Client {
 const string kNetAdapter = "net_adapter";
 const string kRtpType = "rtp_type";
+const string kRtspBeatType = "rtsp_beat_type";
 const string kRtspUser = "rtsp_user";
 const string kRtspPwd = "rtsp_pwd";
 const string kRtspPwdIsMD5 = "rtsp_pwd_md5";