genesis-builder: implemented for all runtimes (#1492)

This PR implements [`GenesisBuilder`
API](https://github.com/paritytech/polkadot-sdk/blob/a414ea7515c9cdc81f1d12410e646afc148250e8/substrate/primitives/genesis-builder/src/lib.rs#L38)
for all the runtimes in polkadot repo.

Step towards: paritytech/polkadot-sdk#25

---------

Co-authored-by: ordian <write@reusable.software>

polkadot/runtime/westend/src/lib.rs

@@ -27,7 +27,9 @@ use beefy_primitives::{
 };
 use frame_election_provider_support::{bounds::ElectionBoundsBuilder, onchain, SequentialPhragmen};
 use frame_support::{
-	construct_runtime, parameter_types,
+	construct_runtime,
+	genesis_builder_helper::{build_config, create_default_config},
+	parameter_types,
 	traits::{
 		fungible::HoldConsideration, ConstU32, Contains, EverythingBut, InstanceFilter,
 		KeyOwnerProofSystem, LinearStoragePrice, ProcessMessage, ProcessMessageError,
@@ -2153,6 +2155,16 @@ sp_api::impl_runtime_apis! {
 			Ok(batches)
 		}
 	}
+
+	impl sp_genesis_builder::GenesisBuilder<Block> for Runtime {
+		fn create_default_config() -> Vec<u8> {
+			create_default_config::<RuntimeGenesisConfig>()
+		}
+
+		fn build_config(config: Vec<u8>) -> sp_genesis_builder::Result {
+			build_config::<RuntimeGenesisConfig>(config)
+		}
+	}
 }
 
 #[cfg(all(test, feature = "try-runtime"))]