Create Benchmarking Setup for Identity Pallet #4695 (#4818)

* Starting

* closer

* Compiles!

* comments

* Create seperate mock

* Remove changes to test env

* Fix step calculation

* Add host function

* Add runtime api

* compiles

* Update to use offchain timestamp

* Gives a result

* added some CLI wip

* make generic

* Update instance

* Remove CLI stuff

* Remove last cli stuff

* undo more changes

* Update benchmarks

* Update Cargo.lock

* remove test

* Move loop out of runtime

* Benchmarking externalities

* Benchmarking state

* Implemented commit

* Make CLI work, move loop back into runtime

* Wipe resets to genesis

* Speedup benchmarks

* Use enum to select extrinsic within pallet

* CLI controls which module and extrinsic to call

* Select a pallet with cli

* Add steps and repeats to cli

* Output as CSV format

* Introduce benchmark pallet

* Append bench

* Use Results

* fix merge

* Clear Identity benchmark

* Bench request judgment and cancel request

* Add final benchmarks

* Fix CSV output

* Start cleaning up for PR

* Bump numbers in `wasmtime` integration tests.

* More docs

* Add rockdb feature to bench

* Fix formatting issues

* Add test feature to bench

* Add test feature to bench

* Add rocksdb feature flag

* Update bench.rs

Co-authored-by: Arkadiy Paronyan <arkady.paronyan@gmail.com>
Co-authored-by: Gavin Wood <github@gavwood.com>

substrate/primitives/io/src/lib.rs

@@ -771,6 +771,30 @@ pub trait Logging {
 	}
 }
 
+/// Interface that provides functions for benchmarking the runtime.
+#[runtime_interface]
+pub trait Benchmarking {
+		/// Get the number of nanoseconds passed since the UNIX epoch
+		///
+		/// WARNING! This is a non-deterministic call. Do not use this within
+		/// consensus critical logic.
+		fn current_time() -> u128 {
+			std::time::SystemTime::now().duration_since(std::time::SystemTime::UNIX_EPOCH)
+				.expect("Unix time doesn't go backwards; qed")
+				.as_nanos()
+		}
+
+		/// Reset the trie database to the genesis state.
+		fn wipe_db(&mut self) {
+			self.wipe()
+		}
+
+		/// Commit pending storage changes to the trie database and clear the database cache.
+		fn commit_db(&mut self) {
+			self.commit()
+		}
+}
+
 /// Wasm-only interface that provides functions for interacting with the sandbox.
 #[runtime_interface(wasm_only)]
 pub trait Sandbox {
@@ -923,6 +947,7 @@ pub type SubstrateHostFunctions = (
 	logging::HostFunctions,
 	sandbox::HostFunctions,
 	crate::trie::HostFunctions,
+	benchmarking::HostFunctions,
 );
 
 #[cfg(test)]