[BUG] [JavaSpring]: optional parameters in delegate method signature are not wrapped in Optional<?>

Description

When generating a spring-mvc controller from an opan api yaml with a non required parameter (required: false) the generated method annotated with request mapping annotations declared the parameter type wrapped in Optional (e.g. Optional myparam )

     @RequestMapping(value = "/search",
        produces = { "application/json" }, 
        method = RequestMethod.GET)
    default ResponseEntity<List<String>> _searchGet(@ApiParam(value = "...") @Valid @RequestParam(value = "query", required = false) Optional<String> query) {
        return searchGet(query);
    }

The method that the call is delegated to ( in this example searchGet) does not declare the parameter as Optional Type:

default ResponseEntity<List<String>> searchGet(String query) {
        return ...
    }

That results in compiler errors in the generated code!

openapi-generator version

3.3.0, master

OpenAPI declaration file content or url

Start with the Spring generator's optionalDataType template and the delegate-pattern output described in the issue. Reproduce the case with the supplied OpenAPI query parameter and Maven configuration, then inspect the generated controller and delegated method. Done means optional parameters use compatible types in both generated signatures and the generated project compiles.