add 110m and 50m natural earth land datasets
update import to add ne 50m/110m land tables
updated earth queries for lower zoom levels
use way_area where possible
add sql to run after tables have been imported

* materialized view for osm_buildings
use materialized view instead of buildings query
update vtm buildings query

Needed to add building and building_part columns to the osm_buildings
materialized view.
use water-z4 queries instead of z6
speed up land use queries with materialized view
specific geometry tolerances for land use zooms

Update the land use materialized view to have specific geometry
simplifications at each zoom level.
simplify building ways for zoom levels
don't simplify dynamically

There's no longer any need to simplify the geometries when querying
against the already pre-simplified materialized views.
create materialized view for water areas
create materialized view for roads
remove vtm roads queries

The vtm roads queries were exactly the same as the others.
add indexes to speed up planet_osm_polygon queries
use land polygons query for earth-z9+

The ne 50m dataset didn't look good at this zoom level. Using the land
polygons dataset at this zoom level seemed to be fast enough.
remove the where clause in the earth queries

The where clause wasn't actually improving performance.
add zoom level 9 geometry for water areas view
adjust roads view zoom levels and data fidelity