Add layer housenumber

layers/housenumber/housenumber.yaml

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+layer:
+  id: "housenumber"
+  description: |
+      [OpenStreetMap housenumbers]
+  buffer_size: 8
+  srs: +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0.0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over
+  fields:
+    class: String
+  datasource:
+    geometry_field: geometry
+    srid: 900913
+    query: (SELECT geometry, housenumber FROM layer_housenumber(!bbox!, z(!scale_denominator!))) AS t
+schema:
+  - ./housenumber_centroid.sql
+  - ./layer.sql
+datasources:
+  - type: imposm3
+    mapping_file: ./mapping.yaml

layers/housenumber/housenumber_centroid.sql

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+UPDATE osm_housenumber_point SET geometry=topoint(geometry)
+WHERE ST_GeometryType(geometry) <> 'ST_Point';

layers/housenumber/layer.sql

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+CREATE OR REPLACE FUNCTION layer_housenumber(bbox geometry, zoom_level integer)
+RETURNS TABLE(osm_id bigint, geometry geometry, housenumber text) AS $$
+    SELECT osm_id, geometry, housenumber FROM osm_housenumber_point
+    WHERE zoom_level >= 14 AND geometry && bbox;
+$$ LANGUAGE SQL IMMUTABLE;

layers/housenumber/mapping.yaml

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+tables:
+  housenumber_point:
+    type: geometry
+    fields:
+    - name: osm_id
+      type: id
+    - name: geometry
+      type: geometry
+    - name: housenumber
+      key: addr:housenumber
+      type: string
+    type_mappings:
+      points:
+        addr:housenumber:
+        - __any__
+      polygons:
+        addr:housenumber:
+        - __any__