Timehash Support

[lotsaocelots1]

I use timehash often for my non-polars work. Not sure what the roadmap is for future polars-hash work, but have you considered integrating timehash into polars-hash?

I did find an existing Rust implementation of the timehash algorithm.

[ion-elgreco]

@lotsaocelots1 I'm open to contributions if you want to add this