geo/geomfn: implement ST_Centroid for Geometry and string #49613
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Also had to add hacks in to handle
POINT EMPTY
decoding -- this iscurrently a problem with both GEOS and twpayne/go-geom, which I have
circumvented for now. An issue has been filed to track this.
Resolves #48893.
Resolves #48805.
Release note (sql change): Implement the ST_Centroid builtin which works
for Geometry and string arguments.