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/Cargo.toml

@@ -62,6 +62,7 @@ members = [
 	"frame/authorship",
 	"frame/babe",
 	"frame/balances",
+	"frame/benchmarking",
 	"frame/collective",
 	"frame/contracts",
 	"frame/contracts/rpc",
@@ -156,6 +157,7 @@ members = [
 	"utils/browser",
 	"utils/build-script-utils",
 	"utils/fork-tree",
+	"utils/frame/benchmarking-cli",
 	"utils/frame/rpc/support",
 	"utils/frame/rpc/system",
 	"utils/wasm-builder",