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/client/db/src/lib.rs

@@ -29,6 +29,9 @@
 pub mod light;
 pub mod offchain;
 
+#[cfg(any(feature = "kvdb-rocksdb", test))]
+pub mod bench;
+
 mod children;
 mod cache;
 mod changes_tries_storage;
@@ -80,6 +83,9 @@ use crate::stats::StateUsageStats;
 use log::{trace, debug, warn};
 pub use sc_state_db::PruningMode;
 
+#[cfg(any(feature = "kvdb-rocksdb", test))]
+pub use bench::BenchmarkingState;
+
 #[cfg(feature = "test-helpers")]
 use sc_client::in_mem::Backend as InMemoryBackend;