Support custom genesis block (#12291)

* Set genesis block data using the built genesis block

* Make resolve_state_version_from_wasm a separate function and some small refactorings

Useful for the commit following.

* Introduce trait BuildGenesisBlock

Substrate users can use this trait to implement their custom genesis block when constructing the
client.

* Make call_executor test compile

* cargo +nightly fmt --all

* Fix test

* Remove unnecessary clone

* FMT

* Apply review suggestions

* Revert changes to new_full_client() and new_full_parts() signature

* Remove needless `Block` type in `resolve_state_version_from_wasm`

substrate/client/service/src/lib.rs

@@ -57,7 +57,10 @@ pub use self::{
 		new_full_parts, spawn_tasks, BuildNetworkParams, KeystoreContainer, NetworkStarter,
 		SpawnTasksParams, TFullBackend, TFullCallExecutor, TFullClient,
 	},
-	client::{ClientConfig, LocalCallExecutor},
+	client::{
+		genesis::{BuildGenesisBlock, GenesisBlockBuilder},
+		resolve_state_version_from_wasm, ClientConfig, LocalCallExecutor,
+	},
 	error::Error,
 };
 pub use config::{