Determine right way of inheriting fields from the base in declarative hook methods

[robcxyz]

Right now we are by default inheriting fields from the parent in declarative hooks. For instance in this hook:

<-:
  foo: bar 
  a_method<-:
    exec: 
      p->: print {{foo}}

It works to call tackle a_method but this raises the question if this should be enabled by default which I think makes sense. It could potentially have a key to disable inheritance or do it selectively but this is up for opinions that can be settled later.

This was initially prompted by the help screen as for a bit, we were rendering the foo kwarg in the help for the a_method. In the unpack_hook function in help.py, we have this condition to render these vars as by the time this has reached the parser, it has already been instantiated.

        elif isinstance(hook_field, dict):
            help_arg = HelpInput(name=i, **hook_field)
        elif isinstance(hook_field, ModelField):
            # If enabling inheritance for base vars in to the help, then this will
            # need to be active.
            # help_arg = HelpInput(
            #     name=i,
            #     type=hook_field.type_.__name__,
            #     # description=hook_field.d  # TODO: Fix this
            # )
            continue
        else:
            raise NotImplementedError

Right now it is disabled as I think this should be something that is toggleable but I don't really know what the right way to do that is.