GPKG: implement ST_GeometryType(), GPKG_IsAsisgnable() and ST_SRID() to be compatible with Geometry Type Triggers and SRS ID Triggers Extensions

git-svn-id: https://svn.osgeo.org/gdal/trunk@27341 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx