consensus: remove caching functionality from block import pipeline (#13551)

* consensus: remove caching functionality from block import pipeline

* client: update docs on Verifier::verify

* node: fix block production benchmark

substrate/primitives/blockchain/src/backend.rs

@@ -288,18 +288,3 @@ pub enum BlockStatus {
 	/// Not in the queue or the blockchain.
 	Unknown,
 }
-
-/// A list of all well known keys in the blockchain cache.
-pub mod well_known_cache_keys {
-	/// The type representing cache keys.
-	pub type Id = sp_consensus::CacheKeyId;
-
-	/// A list of authorities.
-	pub const AUTHORITIES: Id = *b"auth";
-
-	/// Current Epoch data.
-	pub const EPOCH: Id = *b"epch";
-
-	/// Changes trie configuration.
-	pub const CHANGES_TRIE_CONFIG: Id = *b"chtr";
-}

substrate/primitives/consensus/common/src/lib.rs

@@ -39,9 +39,6 @@ pub use select_chain::SelectChain;
 pub use sp_inherents::InherentData;
 pub use sp_state_machine::Backend as StateBackend;
 
-/// Type of keys in the blockchain cache that consensus module could use for its needs.
-pub type CacheKeyId = [u8; 4];
-
 /// Block status.
 #[derive(Debug, PartialEq, Eq)]
 pub enum BlockStatus {