Consolidate frame benchmarking into a frame crate (#4977)

This prs cleans up some of the frame benchmarking stuff:
- Move CLI into `frame-benchmarking-cli`. No frame related CLI should
exists in the default Substrate CLI.
- Move all traits and types related to frame benchmarking into the
`frame-benchmarking` trait. Frame types should be isolated in Frame.

substrate/bin/node/executor/src/lib.rs

@@ -26,5 +26,5 @@ native_executor_instance!(
 	pub Executor,
 	node_runtime::api::dispatch,
 	node_runtime::native_version,
-	sp_io::benchmarking::HostFunctions,
+	frame_benchmarking::benchmarking::HostFunctions,
 );