contracts: Allow contracts to dispatch calls into the runtime (#9276)

* contracts: Allow contracts to dispatch calls into the runtime

* Fix RPC tests

* Fix typo

* Replace () by AllowAllFilter and DenyAllFilter

* Add rust doc

* Fixup for `()` removal

* Fix lowest gas calculation

* Rename AllowAllFilter and DenyAllFilter

* Updated changelog

substrate/frame/system/benchmarking/src/mock.rs

@@ -39,7 +39,7 @@ frame_support::construct_runtime!(
 );
 
 impl frame_system::Config for Test {
-	type BaseCallFilter = ();
+	type BaseCallFilter = frame_support::traits::AllowAll;
 	type BlockWeights = ();
 	type BlockLength = ();
 	type DbWeight = ();