Add support for modules to require inherent to be present (#5792)

* Add support for modules to require inherent to be present

* Bump node impl version

* Allow is_inherent_required itself to return error

This handles the case if runtime fails to check the inherent data (if the
inherent data is invalid, etc).

* typo: &module -> $module

* fix: iter

substrate/bin/node/runtime/src/lib.rs

@@ -83,7 +83,7 @@ pub const VERSION: RuntimeVersion = RuntimeVersion {
 	// implementation changes and behavior does not, then leave spec_version as
 	// is and increment impl_version.
 	spec_version: 244,
-	impl_version: 2,
+	impl_version: 3,
 	apis: RUNTIME_API_VERSIONS,
 	transaction_version: 1,
 };