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/runtime-interface/test/src/lib.rs

@@ -40,6 +40,7 @@ fn call_wasm_method<HF: HostFunctionsT>(method: &str) -> TestExternalities {
 	);
 	executor.call_in_wasm(
 		&WASM_BINARY[..],
+		None,
 		method,
 		&[],
 		&mut ext_ext,
@@ -88,7 +89,7 @@ fn test_return_input_public_key() {
 
 #[test]
 #[should_panic(
-	expected = "\"Instantiation: Export ext_test_api_return_input_version_1 not found\""
+	expected = "Instantiation: Export ext_test_api_return_input_version_1 not found"
 )]
 fn host_function_not_found() {
 	call_wasm_method::<()>("test_return_data");