feat: add AirohaSleep.h helper for faster fix on AG3335 based GPS

src/helpers/sensors/AirohaSleep.h

@@ -0,0 +1,19 @@
+#pragma once
+#include <helpers/sensors/LocationProvider.h>
+
+// Board must keep the GPS RTC backup pin powered and can cut GPS power once we return.
+// Returns true if the command was acked within 3 attempts, otherwise returns false.
+static inline bool airohaEnterSleep(LocationProvider* nmea) {
+  for (uint8_t attempt = 0; attempt < 3; attempt++) {
+    nmea->drain();
+    nmea->sendSentence("$PAIR650,0");
+    if (nmea->waitFor("$PAIR001,650,0", 50)) {  // wait for the command received signal
+      #ifdef GPS_NMEA_DEBUG
+      Serial.printf("Airoha RTC Backup sleep command accepted by GPS after %u attempts\r\n", attempt + 1);
+      #endif
+      nmea->waitFor("$PAIR650,0", 50); // give the GPS 50ms grace to signal it is ready for sleep
+      return true;
+    }
+  }
+  return false;
+}