Don't include :code by default in storage proofs (#5179)

* Don't include `:code` by default in storage proofs (#5060)

* Adds test to verify that the runtime currently is always contained in
the proof

* Start passing the runtime wasm code from the outside

* Fix compilation

* More build fixes

* Make the test work as expected now :)

* Last fixes

* Fixes benchmarks

* Review feedback

* Apply suggestions from code review

Co-Authored-By: Sergei Pepyakin <sergei@parity.io>

* Review feedback

* Fix compilation

Co-authored-by: Sergei Pepyakin <s.pepyakin@gmail.com>

* Fix compilation and change the way `RuntimeCode` works

* Fix tests

* Switch to `Cow`

Co-authored-by: Benjamin Kampmann <ben@gnunicorn.org>
Co-authored-by: Sergei Pepyakin <s.pepyakin@gmail.com>

substrate/primitives/api/test/tests/runtime_calls.rs

@@ -164,6 +164,12 @@ fn record_proof_works() {
 	let block_id = BlockId::Number(client.chain_info().best_number);
 	let storage_root = longest_chain.best_chain().unwrap().state_root().clone();
 
+	let runtime_code = sp_core::traits::RuntimeCode {
+		code_fetcher: &sp_core::traits::WrappedRuntimeCode(client.code_at(&block_id).unwrap().into()),
+		hash: vec![1],
+		heap_pages: None,
+	};
+
 	let transaction = Transfer {
 		amount: 1000,
 		nonce: 0,
@@ -192,5 +198,6 @@ fn record_proof_works() {
 		&executor,
 		"Core_execute_block",
 		&block.encode(),
+		&runtime_code,
 	).expect("Executes block while using the proof backend");
 }