Restructure dispatch macro related exports (#1162)

* restructure dispatch macro related exports

* moved Dispatchable to lib.rs

* fix .gitignore final newline

* ".git/.scripts/commands/fmt/fmt.sh"

* fix rustdocs

* wip

---------

Co-authored-by: Liam Aharon <liam.aharon@hotmail.com>
Co-authored-by: command-bot <>
Co-authored-by: ordian <write@reusable.software>

substrate/frame/staking/src/migrations.rs

@@ -19,8 +19,9 @@
 use super::*;
 use frame_election_provider_support::SortedListProvider;
 use frame_support::{
-	dispatch::GetStorageVersion, pallet_prelude::ValueQuery, storage_alias,
-	traits::OnRuntimeUpgrade,
+	pallet_prelude::ValueQuery,
+	storage_alias,
+	traits::{GetStorageVersion, OnRuntimeUpgrade},
 };
 
 #[cfg(feature = "try-runtime")]