Added one minute throttling to NodeDB save to disk (#3648)

* Added one minute throttling to NodeDB

* Derp

src/mesh/Throttle.h

@@ -0,0 +1,9 @@
+#pragma once
+#include <cstddef>
+#include <cstdint>
+
+class Throttle
+{
+  public:
+    static bool execute(uint32_t *lastExecutionMs, uint32_t minumumIntervalMs, void (*func)(void), void (*onDefer)(void) = NULL);
+};