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

* Added one minute throttling to NodeDB

* Derp

src/mesh/Throttle.cpp

@@ -0,0 +1,27 @@
+#include "Throttle.h"
+#include <Arduino.h>
+
+/// @brief Execute a function throttled to a minimum interval
+/// @param lastExecutionMs Pointer to the last execution time in milliseconds
+/// @param minumumIntervalMs Minimum execution interval in milliseconds
+/// @param throttleFunc Function to execute if the execution is not deferred
+/// @param onDefer Default to NULL, execute the function if the execution is deferred
+/// @return true if the function was executed, false if it was deferred
+bool Throttle::execute(uint32_t *lastExecutionMs, uint32_t minumumIntervalMs, void (*throttleFunc)(void), void (*onDefer)(void))
+{
+    if (*lastExecutionMs == 0) {
+        *lastExecutionMs = millis();
+        throttleFunc();
+        return true;
+    }
+    uint32_t now = millis();
+
+    if ((now - *lastExecutionMs) >= minumumIntervalMs) {
+        throttleFunc();
+        *lastExecutionMs = now;
+        return true;
+    } else if (onDefer != NULL) {
+        onDefer();
+    }
+    return false;
+}