Rename ModuleToIndex to PalletRuntimeSetup (#7148)

* Rename `ModuleToIndex` to `PalletRuntimeSetup`

Besides the renaming it also adds support getting the name of a pallet
as configured in the runtime.

* Rename it to `PalletInfo`

* Remove accidentally added files

substrate/frame/support/test/tests/instance.rs

@@ -241,7 +241,7 @@ impl system::Trait for Runtime {
 	type BlockNumber = BlockNumber;
 	type AccountId = AccountId;
 	type Event = Event;
-	type ModuleToIndex = ();
+	type PalletInfo = ();
 	type Call = Call;
 }