Implement GeoSeries: type, unary_union, delaunay_triangles, voronoi_polygons, disjoint, m

[jiayuasu]

Description

Implement Tier 2 batch D GeoSeries functions for the geopandas compatibility module.

Functions to implement:

• type — property returning geometry type names (alias for geom_type)
• unary_union — deprecated property that delegates to union_all()
• delaunay_triangles — element-wise Delaunay triangulation via ST_DelaunayTriangles
• voronoi_polygons — element-wise Voronoi diagram via ST_VoronoiPolygons
• disjoint — binary predicate via ST_Disjoint
• m — returns M coordinate via ST_M

Not included (blocked by upstream bugs):

• geom_equals — blocked by ST_Equals throws IllegalArgumentException on GeometryCollection inputs #2722 (ST_Equals crashes on GeometryCollection)
• frechet_distance — blocked by ST_FrechetDistance returns 0.0 instead of null for empty geometries #2720 (ST_FrechetDistance returns 0.0 for empty geometries)
• hausdorff_distance — blocked by ST_HausdorffDistance returns 0.0 instead of null for empty geometries #2721 (ST_HausdorffDistance returns 0.0 for empty geometries)

Part of #2230.