Extend Factory check_definition method to include a check_instance method

[timsavage]

Currently, factories include checks to confirm settings are correct, this can be extended to doing instance checks, however, this requires boilerplate code that could be included in the core library.

eg:

def check_definition(self, Dict[str, Dict[str, Any]], name: str, **_):
    messages = super().check_definition(check_definitions, name, **_)
    if any(message.level >= ERROR for message in messages):
        return messages

    messages.extend(self.check_instance(check_definitions, name, **_))
    return messages