Add existing code: Power consumption test cases and Semaphore power scheduler skeleton

example/advanced/Power_Measurements/IMU/IMU.ino

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+#include "Dezibot.h"
+
+Dezibot dezibot;
+
+// How many times to run a command on the IMU consecutively;
+const uint16_t iterations = 5000;
+
+void setup() {
+  dezibot.motion.detection.begin();
+  //dezibot.motion.detection.end();
+  // put your setup code here, to run once:
+  Serial.begin(115200);
+  // Wait for Serial to init
+  while (!Serial) {
+    ;;
+  }
+  // Test if IMU is working correctly
+  char imu_whoami = dezibot.motion.detection.getWhoAmI();
+  if (imu_whoami == 0x67) {
+    Serial.println("IMU seems to be working. Starting measurements...");
+  } else {
+    Serial.println("IMU does not seemm to be working correctly.");
+    exit(0);
+  }
+  dezibot.motion.detection.end();
+  Serial.println("Returned IMU to low-power mode. Killing Serial peripheral. Goodbye!");
+  delay(1000);
+  Serial.end();
+  delay(1000);
+}
+
+void loop() {
+  // This puts both accelerometer and gyroscope into low noise mode, which is their highest
+  // power consumption state
+  dezibot.motion.detection.begin();
+  for (uint16_t iter = 0; iter < iterations; iter++) {
+    dezibot.motion.detection.getRotation();
+    dezibot.motion.detection.getAcceleration();
+    delay(1);
+  }
+  // Turn everything back off to measure baseline power consumption
+  delay(iterations);
+}