Add proper test Custom values (#1147)

* add proper tests for custom values

* remove try operators

* use sustrate compat for import of hash

* add license and hex

* add script to artifacts.sh

* custom values with ids not in metadata can be accessed in static interface

* fmt and clippy

* access bytes of custom values directly, even if type id wrong

* final fixes

* removing substrate-compat flag from ui tests

* Update subxt/src/custom_values/custom_values_client.rs

Co-authored-by: James Wilson <james@jsdw.me>

* remove types access in type generator

* 2 extra lines

---------

Co-authored-by: James Wilson <james@jsdw.me>

testing/ui-tests/src/lib.rs

@@ -11,7 +11,6 @@
 //! Use with `TRYBUILD=overwrite` after updating codebase (see `trybuild` docs for more details on that)
 //! to automatically regenerate `stderr` files, but don't forget to check that new files make sense.
 
-mod custom_values;
 mod dispatch_errors;
 mod storage;
 mod utils;
@@ -21,13 +20,13 @@ use crate::utils::MetadataTestRunner;
 // Each of these tests leads to some rust code being compiled and
 // executed to test that compilation is successful (or errors in the
 // way that we'd expect).
+
 #[test]
 fn ui_tests() {
     let mut m = MetadataTestRunner::default();
     let t = trybuild::TestCases::new();
 
     t.pass("src/correct/*.rs");
-
     // Check that storage maps with no keys are handled properly.
     t.pass(
         m.new_test_case()
@@ -52,12 +51,6 @@ fn ui_tests() {
             .build(dispatch_errors::metadata_array_dispatch_error()),
     );
 
-    t.pass(
-        m.new_test_case()
-            .name("custom_values_foo")
-            .build(custom_values::metadata_custom_values_foo()),
-    );
-
     // Test retaining only specific pallets and ensure that works.
     for pallet in ["Babe", "Claims", "Grandpa", "Balances"] {
         let mut metadata = MetadataTestRunner::load_metadata();