Support ray-based sorting for btree index

[touch-of-grey]

I saw the high-performance btree index build in lance-format/lance#5164, but I don't see ray supporting it. @chenghao-guo @jackye1995 is there a plan to implement it? If not I am happy to give a try

[chenghao-guo]

Hi @touch-of-grey , that would be awesome! Contributions are always welcome. If you're willing to pick it up, that would be fantastic. Feel free to open a PR to implement your plan.