Metadata V16: Implement support for Pallet View Functions (#1981)

* Support Pallet View Functions in Subxt

* fmt

* clippy

* Move a little view function logic to subxt_core

* clippy

* Add back check that prob isnt needed

* avoid vec macro in core

* Add view funciton test and apply various fixes to get it working

* Add test for dynamic view fn call and fix issues

* clippy

* fix test-runtime

* fmt

* remove export

* avoid vec for nostd core

* use const instead of fn for view fn call name

* Update to support latest unstable metadata

* Update metadata stripping tests for new v16 version

codegen/src/api/runtime_apis.rs

@@ -78,7 +78,8 @@ fn generate_runtime_api(
                     // Generate alias for runtime type.
                     let ty = type_gen
                         .resolve_type_path(input.ty)
-                        .expect("runtime api input type is in metadata; qed").to_token_stream(type_gen.settings());
+                        .expect("runtime api input type is in metadata; qed")
+                        .to_token_stream(type_gen.settings());
                     let aliased_param = quote!( pub type #alias_name = #ty; );
 
                     // Structures are placed on the same level as the alias module.