Display boundaries and borders

[bchapuis]

Description: Openstreetmap contains tags for boundaries and borders and we should properly display them at low and high zoom levels. We currently display borders at level 13 and greater. This change probably requires to do some line work and simplifications in the database and possibly in the java code as well (for handling complex multipolygons).

Tag: https://wiki.openstreetmap.org/wiki/Key:boundary

Attachements:

Files: https://github.com/apache/incubator-baremaps/tree/main/basemap/layers/boundary