Dynamic Benchmarking DB Whitelist (#6815)

* Add `get_whitelist` api

* add whitelisted caller

* Whitelist caller

* remove caller 0

* initial piping of origin (not actual value yet)

* remove attempt to pass origin around

* Add whitelist for `DidUpdate` storage on `pallet_timestamp`

* fix traits

* only add to whitelist if !contains

* PassBy not implemented error

* Whitelist read/writes explicitly per key

* update docs

* reduce trait constraint

* copy pasta

* Apply suggestions from code review

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

* rename functions @apopiak

* missed some renaming

* enable doc tests

* Update docs

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>
Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

substrate/primitives/state-machine/src/basic.rs

@@ -27,7 +27,7 @@ use sp_trie::trie_types::Layout;
 use sp_core::{
 	storage::{
 		well_known_keys::is_child_storage_key, Storage,
-		ChildInfo, StorageChild,
+		ChildInfo, StorageChild, TrackedStorageKey,
 	},
 	traits::Externalities, Blake2Hasher,
 };
@@ -325,7 +325,11 @@ impl Externalities for BasicExternalities {
 		unimplemented!("reset_read_write_count is not supported in Basic")
 	}
 
-	fn set_whitelist(&mut self, _: Vec<Vec<u8>>) {
+	fn get_whitelist(&self) -> Vec<TrackedStorageKey> {
+		unimplemented!("get_whitelist is not supported in Basic")
+	}
+
+	fn set_whitelist(&mut self, _: Vec<TrackedStorageKey>) {
 		unimplemented!("set_whitelist is not supported in Basic")
 	}
 }