Improve CodeExecutor (#2358)

Since `sp-state-machine` and `GenesisConfigBuilderRuntimeCaller` always
set `use_native` to be false.
We should remove this param and make `NativeElseWasmExecutor` behave
like its name.
It could make the above components use the correct execution strategy.

Maybe polkadot do not need about `NativeElseWasmExecutor` anymore. But
it is still needed by other chains and it's useful for debugging.

---------

Co-authored-by: Bastian Köcher <git@kchr.de>
Co-authored-by: command-bot <>
Co-authored-by: Michal Kucharczyk <1728078+michalkucharczyk@users.noreply.github.com>

substrate/bin/node/cli/benches/executor.rs

@@ -103,14 +103,7 @@ fn construct_block<E: Externalities>(
 
 	// execute the block to get the real header.
 	executor
-		.call(
-			ext,
-			&runtime_code,
-			"Core_initialize_block",
-			&header.encode(),
-			true,
-			CallContext::Offchain,
-		)
+		.call(ext, &runtime_code, "Core_initialize_block", &header.encode(), CallContext::Offchain)
 		.0
 		.unwrap();
 
@@ -121,7 +114,6 @@ fn construct_block<E: Externalities>(
 				&runtime_code,
 				"BlockBuilder_apply_extrinsic",
 				&i.encode(),
-				true,
 				CallContext::Offchain,
 			)
 			.0
@@ -135,7 +127,6 @@ fn construct_block<E: Externalities>(
 				&runtime_code,
 				"BlockBuilder_finalize_block",
 				&[0u8; 0],
-				true,
 				CallContext::Offchain,
 			)
 			.0
@@ -200,7 +191,6 @@ fn bench_execute_block(c: &mut Criterion) {
 							&runtime_code,
 							"Core_execute_block",
 							&block.0,
-							false,
 							CallContext::Offchain,
 						)
 						.0