[FEATURE] ADD data type GEOGRAPHY

[AntoineYon]

Data type GEOGRAPHY is unknown !

Add the GEOGRAPHY data type for the POSTGIS extension (very well known and widely used).

[VeerShah41]

Hi! I'd like to work on this. I can see the codebase already has other PostGIS-style geometric types (e.g. GEOMETRY, POINT, LINESTRING, etc.) defined in

datatypes.js
using geometricColor. I'll add GEOGRAPHY to the PostgreSQL types block following the same pattern — should be a very minimal, focused change. I'll submit a PR shortly!