Remove postgis_tiger_geocoder and address_standardizer from the PostGIS code base

[Tobias Bussmann]

> I'd like to remove postgis_tiger_geocoder and address_standardizer from the
> PostGIS code base and spin those off as separate project repos.


> I'm thinking doing this for the PostGIS 3.7 cycle.


+1 

Sound quite reasonable to me, these were kind of aliens in PostGIS anyhow. Separating them with different release timings can support to wrap PostGIS releases on schedule.

Best regards,
Tobias