address_standardizer/tiger_geocoder split

[Paul Ramsey]

Hey developers, a little update you might not have noticed but that
has important implications for packagers.

>From NEWS:

- #6053, [address_standardizer] Extension removed and moved to
  https://github.com/postgis/address_standardizer (Paul Ramsey)
- #6052, [tiger_geocoder] Extension removed and moved to
  https://git.osgeo.org/postgis/postgis_tiger_geocoder (Regina Obe)

They have been split off of the main repo because they are
structurally independent. In the case of address_standardizer, also
basically developmentally dormant. In the case of the geocoder,
governed by a different release cadence (the US Census data release
cadence) than the rest of the PostGIS suite, which dances to the PgSQL
cadence.

ATB,
P