keep track storage bytes (#2154)

* refactor

* fix accountinfo creation + impl mem_stored

* add comment

* improve syntax

Co-Authored-By: thiolliere <gui.thiolliere@gmail.com>

* rename current_mem_stored -> storage_size

* more explaination + more readable code

* bump impl version of node + builds

* delete builds

substrate/node/runtime/src/lib.rs

@@ -60,7 +60,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	impl_name: create_runtime_str!("substrate-node"),
 	authoring_version: 10,
 	spec_version: 55,
-	impl_version: 55,
+	impl_version: 56,
 	apis: RUNTIME_API_VERSIONS,
 };