Implement error handling

[sobolevn]

I have troubles in creating a declarative error handling. But, thanks to hanami authors that there's a nice concept in their framework: https://guides.hanamirb.org/actions/exception-handling/

So, how should this be solved?

class UserListMethod(BodylessMethod):
      exceptions = {
            TypeError: Error(status=403, message='User is an alien!'),
            AttributeError: 403,
            SomeCustomError: callable,  # type: Callable[[request, request_payload, exception], Error]
      }

     ...