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/contracts/src/storage.rs

@@ -27,7 +27,6 @@ use crate::{
 };
 use codec::{Decode, Encode, MaxEncodedLen};
 use frame_support::{
-	dispatch::DispatchError,
 	storage::child::{self, ChildInfo},
 	weights::Weight,
 	CloneNoBound, DefaultNoBound,
@@ -37,7 +36,7 @@ use sp_core::Get;
 use sp_io::KillStorageResult;
 use sp_runtime::{
 	traits::{Hash, Saturating, Zero},
-	BoundedBTreeMap, DispatchResult, RuntimeDebug,
+	BoundedBTreeMap, DispatchError, DispatchResult, RuntimeDebug,
 };
 use sp_std::{marker::PhantomData, prelude::*};