Create conda package for install with `conda`/`mamba`

[dangotbanned]

I was hoping to benchmark fastexcel vs xlsx2csv to determine if I'd benefit from the performance in the context of polars.

I haven't found any discussion mentioning conda-forge, but they have a guide for contributing packages.

Would this be something you could add to your CI?

Edit: Since polars is similar in the python/rust overlap, the polars-feedstock might be a helpful reference.