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/bin/node-template/pallets/template/src/mock.rs

@@ -27,7 +27,7 @@ parameter_types! {
 }
 
 impl system::Config for Test {
-	type BaseCallFilter = ();
+	type BaseCallFilter = frame_support::traits::AllowAll;
 	type BlockWeights = ();
 	type BlockLength = ();
 	type DbWeight = ();

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

@@ -146,7 +146,7 @@ parameter_types! {
 
 impl frame_system::Config for Runtime {
 	/// The basic call filter to use in dispatchable.
-	type BaseCallFilter = ();
+	type BaseCallFilter = frame_support::traits::AllowAll;
 	/// Block & extrinsics weights: base values and limits.
 	type BlockWeights = BlockWeights;
 	/// The maximum length of a block (in bytes).