Fixed #23537 -- Added Oracle GIS SchemaEditor.

It seems so. The current scheme generates something like: `gis_neighborhood_geom_id`. If we switched to `self._create_index_name(model, [field.column], suffix="_id")`, we'd get something like `gis_ne_geom_7c986de888917b7_id`. I guess we shouldn't do that so people can still modify their existing tables. I'll add a comment about this and rename the method.