Add GeoHash primitive

> Geohash is a public domain geocode system invented in 2008 by Gustavo Niemeyer[1] and (similar work in 1966) G.M. Morton,[2] which encodes a geographic location into a short string of letters and digits.
- https://en.wikipedia.org/wiki/Geohash
- Found [here](https://github.com/DataCanvasIO/Hypernets/blob/4ff86cdebc7e15636900aa26b3a9db6154d543a1/hypernets/tabular/feature_generators/_primitives.py#L85):

```python
class GeoHashPrimitive(TransformPrimitive):
name = "geohash"
input_types = [LatLong]
return_type = Categorical
```