Full block import benchmark (#4865)

* full block import benchmark

* try rocksdb cache

* add profiling helper

* use random keyring instead of zero caching

* update docs

* add more io stats

* remove last sentence

* add ci job to see

* Update primitives/keyring/src/sr25519.rs

Co-Authored-By: Marcio Diaz <marcio.diaz@gmail.com>

* switch to 100tx-block

* remove ci script

Co-authored-by: Marcio Diaz <marcio@parity.io>

substrate/primitives/keyring/src/sr25519.rs

@@ -86,7 +86,6 @@ impl Keyring {
 	pub fn public(self) -> Public {
 		self.pair().public()
 	}
-
 	pub fn to_seed(self) -> String {
 		format!("//{}", self)
 	}