Add spatial polars implementation of spatial bench queries

[ATL2001]

Per the discussion on discord, I'd like to add the spatial bench queries implemented using spatial polars. It's certainly not as fast as SedonaDB, and I'm not sure how long I'll keep it maintained once geopandas gets unblocked, (I expect that to easily eclipse what I've built, and when it gets rolling, I intend to help out on that project, and spatial polars will likely get left behind)

It's not completely 1:1 with the SQL based queries, but I believe I've stayed true to the intent. The KNN join that I implemented in spatial polars for Q12 only takes into account the centroids of the buildings, I'm not sure how the other engines approach that, but I felt like I was slightly cheating... 🙁

[jiayuasu]

Great work!

Can you update the README as well to include Spatial polars?

[ATL2001]

would you like me to add a little blurb to the README about spatial polars also not being SQL based similar to geopandas?

[MrPowers]

@ATL2001 - this PR looks great and thanks for contributing!

@jiayuasu - looks like a reference was added to the README. Are any other changes needed or can we merge this?

[jiayuasu]

@ATL2001 Can you please add this?

would you like me to add a little blurb to the README about spatial polars also not being SQL based similar to geopandas?

[ATL2001]

I'll make some time this weekend to add to it. Given it's relative obscurity, are you open to me adding a link to the docs (googling spatial polars gives you results for geopolars and polars-ST).

[jiayuasu]

I'll make some time this weekend to add to it. Given it's relative obscurity, are you open to me adding a link to the docs (googling spatial polars gives you results for geopolars and polars-ST).

@ATL2001 All sound good to me!

[ATL2001]

I added a little section below the geopandas section for it, I didn't want to sound like a commercial, so I kept it to a minimum!