MQTT client proxying (#2587)

* WIP on MQTT proxy message queue

* Fix copy paste goof

* Progress on uplink

* Has packets

* Avoid trying to connect if we're proxying

* Pointer correctly

* Remove wifi guards

* Client proxy subscribe

* Fixed method that got bababababorked somehow... personally I blame CoPilot

* Short circuit logic

* Remove canned settings

* Missed some stuff in the move

* Guard pubsub client for non-networked variants

* Has networking guard

* else

* Return statement for fall-thru

* More gaurd removals

* Removed source filters. No wonder I was confused

* Bounding

* Scope guard around else and fix return

* Portduino

* Defs instead

* Move macro up to actually fix portduino

* Size_t

* Unsigned int

* Thread interval

* Protos

* Protobufs ref

src/mesh/PhoneAPI.h

@@ -50,6 +50,9 @@ class PhoneAPI
     // Keep QueueStatus packet just as packetForPhone
     meshtastic_QueueStatus *queueStatusPacketForPhone = NULL;
 
+    // Keep MqttClientProxyMessage packet just as packetForPhone
+    meshtastic_MqttClientProxyMessage *mqttClientProxyMessageForPhone = NULL;
+
     /// We temporarily keep the nodeInfo here between the call to available and getFromRadio
     meshtastic_NodeInfo nodeInfoForPhone = meshtastic_NodeInfo_init_default;
 
@@ -126,6 +129,8 @@ class PhoneAPI
 
     void releaseQueueStatusPhonePacket();
 
+    void releaseMqttClientProxyPhonePacket();
+
     /// begin a new connection
     void handleStartConfig();