Development and maintenance of GeoAPI wrappers for PROJ moved to a separated project:
The PROJ native bindings in Apache SIS should be removed. Maybe we will recreate that module in the future if we want to add GDAL bindings instead of only PROJ, but current implementation did not reach that level. Furthermore the JEP 191: Foreign Function Interface may change the way to do that. Alternatively we may also do this binding by expanding above-cited Kortforsyningen project instead of doing this work in SIS.