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/example/src/lib.rs

@@ -764,7 +764,7 @@ mod tests {
 		type MaximumBlockLength = MaximumBlockLength;
 		type AvailableBlockRatio = AvailableBlockRatio;
 		type Version = ();
-		type ModuleToIndex = ();
+		type PalletInfo = ();
 		type AccountData = pallet_balances::AccountData<u64>;
 		type OnNewAccount = ();
 		type OnKilledAccount = ();