Add maritime and disputed to boundaries import in imposm3.json

[PetersonGIS]

Where tags include "maritime"=>"yes" and/or "boundary_type"=>"maritime", make a column in osm_admin_areas called "maritime" and set to 1 or yes. There may be one or more additional maritime tag indicators. We should search the existing db to see.

Where tags include "boundary_disputed"=>*, make a column in osm_admin_areas called "disputed" and set to 1 or yes. There may be one or more additional disputed tag indicators. We should search the existing db to see.