GPKG: implement ExecuteSQL() for commands (but SELECT are still handled by generic ExecuteSQL() code) (#5394)

git-svn-id: https://svn.osgeo.org/gdal/trunk@27085 f0d54148-0727-0410-94bb-9a71ac55c965
Update .gitignore

git-svn-id: https://svn.osgeo.org/gdal/trunk@27086 f0d54148-0727-0410-94bb-9a71ac55c965