AP_InertialSensor: add static create method

libraries/AP_InertialSensor/AP_InertialSensor.h

@@ -46,7 +46,13 @@ class AP_InertialSensor : AP_AccelCal_Client
     friend class AP_InertialSensor_Backend;
 
 public:
-    AP_InertialSensor();
+    static AP_InertialSensor create() { return AP_InertialSensor{}; }
+
+    constexpr AP_InertialSensor(AP_InertialSensor &&other) = default;
+
+    /* Do not allow copies */
+    AP_InertialSensor(const AP_InertialSensor &other) = delete;
+    AP_InertialSensor &operator=(const AP_InertialSensor&) = delete;
 
     static AP_InertialSensor *get_instance();
 
@@ -263,6 +269,7 @@ public:
     uint32_t get_last_update_usec(void) const { return _last_update_usec; }
 
 private:
+    AP_InertialSensor();
 
     // load backend drivers
     bool _add_backend(AP_InertialSensor_Backend *backend);