Add Postgres Inet types

[abstractqqq]

Describe your feature request

Inet types are essentially data types for IP addresses. I know that arrow doesn't have this type yet, but can we at least add an option to cast inet to strings?

You can find more about postgres inet types here.

Please describe the behavior you want and the motivation.

For people doing analytics, it is common to run a query like

select * from table limit 100

And if there is a inet type in the schema, it panics now with the error "not implemented inet". I think for inet types it is very reasonable to cast them to string.