removes use of sc_client::Client from sc-rpc (#5063)

* removes use of sc_client::Client from sc-rpc

* remove Client impl from sc-finality-benches

* remove client impl from sc-finality-grandpa

* read_proof accepts iterator

* remove generic Executor param from ExecutorProvider

* fix long ass line

* code style changes

* merge with master

Co-authored-by: Arkadiy Paronyan <arkady.paronyan@gmail.com>

substrate/client/service/src/builder.rs

@@ -23,6 +23,7 @@ use sc_client_api::{
 	BlockchainEvents,
 	backend::RemoteBackend, light::RemoteBlockchain,
 	execution_extensions::ExtensionsFactory,
+	ExecutorProvider, CallExecutor
 };
 use sc_client::Client;
 use sc_chain_spec::{RuntimeGenesis, Extension};
@@ -799,7 +800,9 @@ ServiceBuilder<
 			TBackend::OffchainStorage,
 			TBl
 		>,
-	>, Error> {
+	>, Error>
+		where TExec: CallExecutor<TBl, Backend = TBackend>,
+	{
 		let ServiceBuilder {
 			marker: _,
 			mut config,