The GIS function ST_IsValid takes ad input a geometry and returns 1
if the argument is geometrically valid, 0 if the argument is not
geometrically valid.

Author: StefanoPetrilli <stefanop_1999@hotmail.it>
Co-authored-by: Ahmed Ibrahim <ahmed.ibr.hashim@gmail.com>
Co-authored-by: Jon Olav Hauglid <jon.hauglid@oracle.com>
Co-authored-by: Erlend Dahl <erlend.dahl@oracle.com>
Co-authored-by: Norvald H. Ryeng <norvald.ryeng@oracle.com>
Co-authored-by: Menelaos Karavelas <menelaos.karavelas@oracle.com>
Co-authored-by: David.Zhao <david.zhao@oracle.com>
Co-authored-by: Pavan <pavan.naik@oracle.com>