Typecheck and compile opaque wrapping functions

This enables you to write something like

```
A := U8
List.map [1, 2, 3] @A
```

which will be compiled as if it was `List.map [1, 2, 3] \x -> @A x`.

Closes #3499

crates/compiler/can/src/module.rs

@@ -970,5 +970,6 @@ fn fix_values_captured_in_closure_expr(
             let (_, loc_arg) = &mut **argument;
             fix_values_captured_in_closure_expr(&mut loc_arg.value, no_capture_symbols);
         }
+        OpaqueWrapFunction(_) => {}
     }
 }