Introducing a `status` prop type

[pudo]

We've got status fields on various types of entities in FtM, including Sanction, Occupancy etc. What goes into them is not defined, and so they're relatively useless in practice. I wonder if we should make them an enum type, perhaps based on:

https://github.com/opensanctions/opensanctions/blob/main/zavod/zavod/logic/pep.py#L21-L24