Add the ability to set Deferrable/Deferred from console.

The equivalent in `pgAdmin` is these two checks


right now we have to go and manually edit the generated migration to add `DEFERRABLE INITIALLY DEFERRED`.

Example Migration:

```
ALTER TABLE public.xxx
ADD CONSTRAINT xxx_id_fkey FOREIGN KEY (y_id)
REFERENCES public.yyy (id) MATCH SIMPLE
ON UPDATE NO ACTION
ON DELETE NO ACTION
DEFERRABLE INITIALLY DEFERRED;
```