Pico W: Initial Wi-Fi support (#2980)

* Pico W: Initial WiFi support: connects, but freezes after a while

* Update arduino-pico core to fix hang with Wi-Fi

* Add `picow` to workflow since it's different from `pico` now

src/mesh/wifi/WiFiAPClient.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "concurrency/Periodic.h"
+#include "configuration.h"
+#include <Arduino.h>
+#include <functional>
+
+#if defined(HAS_WIFI) && !defined(ARCH_PORTDUINO)
+#include <WiFi.h>
+#endif
+
+extern bool needReconnect;
+extern concurrency::Periodic *wifiReconnect;
+
+/// @return true if wifi is now in use
+bool initWifi();
+
+void deinitWifi();
+
+bool isWifiAvailable();
+
+uint8_t getWifiDisconnectReason();