RPC: Implement storage_stat_request (#800)

* RPC: Update protobuf sources
* RPC: Implement storage_stat_request
* RPC: Test storage_stat_request
* FuriRecord: fix use after free in destroy method.
* Furi: refactor PubSub and it's usage. Fix allocation in RPC.
* FuriCore: fix memory leak in pubsub
* FuriCore: update unsubscribe method signature in pubsub, make subscription structure lighter.
* FuriCore: remove dead code

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

applications/storage/storage-glue.h

@@ -1,8 +1,10 @@
 #pragma once
+
 #include <furi.h>
 #include "filesystem-api-internal.h"
 #include <m-string.h>
 #include <m-array.h>
+#include <m-list.h>
 
 #ifdef __cplusplus
 extern "C" {