[FL-2809] Rework BLE key storage (#2154)

* bt: disconnect first on profile change
* bt keys: rework bt keys
* saved struct: add payload size getter to API
* bt: rework bt with new key storage API
* bt: add keys storage operation to bt API
* hid: save bt keys on sd card
* bt: add unit tests for key storage
* bt: working profile switch
* bt: cleanup
* bt hid: change keys storage path

Co-authored-by: あく <alleteam@gmail.com>

applications/services/bt/bt_service/bt.h

@@ -56,6 +56,19 @@ void bt_set_status_changed_callback(Bt* bt, BtStatusChangedCallback callback, vo
  */
 void bt_forget_bonded_devices(Bt* bt);
 
+/** Set keys storage file path
+ *
+ * @param bt                    Bt instance
+ * @param keys_storage_path     Path to file with saved keys
+ */
+void bt_keys_storage_set_storage_path(Bt* bt, const char* keys_storage_path);
+
+/** Set default keys storage file path
+ *
+ * @param bt                    Bt instance
+ */
+void bt_keys_storage_set_default_path(Bt* bt);
+
 #ifdef __cplusplus
 }
 #endif