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/src/metadata.rs

@@ -297,7 +297,7 @@ mod tests {
 			type AccountId: From<u32> + Encode;
 			type BlockNumber: From<u32> + Encode;
 			type SomeValue: Get<u32>;
-			type ModuleToIndex: crate::traits::ModuleToIndex;
+			type PalletInfo: crate::traits::PalletInfo;
 			type Call;
 		}
 
@@ -443,7 +443,7 @@ mod tests {
 		type AccountId = u32;
 		type BlockNumber = u32;
 		type SomeValue = SystemValue;
-		type ModuleToIndex = ();
+		type PalletInfo = ();
 		type Call = Call;
 	}