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>

substrate/bin/node-template/runtime/src/lib.rs

@@ -23,6 +23,7 @@ use sp_std::prelude::*;
 use sp_version::NativeVersion;
 use sp_version::RuntimeVersion;
 
+use frame_support::genesis_builder_helper::{build_config, create_default_config};
 // A few exports that help ease life for downstream crates.
 pub use frame_support::{
 	construct_runtime, parameter_types,
@@ -571,4 +572,14 @@ impl_runtime_apis! {
 			Executive::try_execute_block(block, state_root_check, signature_check, select).expect("execute-block failed")
 		}
 	}
+
+	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)
+		}
+	}
 }