show pairing and mqtt status in configuration page

Network.h

@@ -14,6 +14,8 @@ public:
     void initialize();
     void update();
 
+    bool isMqttConnected();
+
     void publishKeyTurnerState(const char* state, const char* trigger, const char* completionStatus);
     void publishBatteryReport(const BatteryReport& batteryReport);
 
@@ -32,6 +34,8 @@ private:
     WiFiClient _wifiClient;
     Preferences* _preferences;
 
+    bool _mqttConnected = false;
+
     unsigned long _nextReconnect = 0;
     char _mqttBrokerAddr[100] = {0};