Prevent double allocation of the payload when calling sp_io::storage::get (#11523)

* Expose allocation stats in `FreeingBumpHeapAllocator`

* Return allocation stats when calling into the runtime

* Bump `parity-scale-codec` to 3.1.3 (fork)

* Prevent double allocation of the payload when calling `sp_io::storage::get`

* Fix tests

* Remove unnecessary `mut`

* Enable the `bytes` feature for `parity-scale-codec` in `sp-runtime-interface`

* Update client/allocator/src/freeing_bump.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* Bump `parity-scale-codec` to 3.1.3

* Fix some of the UI tests

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

substrate/frame/support/src/storage/unhashed.rs

@@ -155,7 +155,7 @@ pub fn clear_prefix(
 
 /// Get a Vec of bytes from storage.
 pub fn get_raw(key: &[u8]) -> Option<Vec<u8>> {
-	sp_io::storage::get(key)
+	sp_io::storage::get(key).map(|value| value.to_vec())
 }
 
 /// Put a raw byte slice into storage.