Add ability to export arrow-ffi to vortex-ffi crate

[ivagulin]

Hi Folks,

I believe vortex-ffi will become much more useful if we add ability to get arrays in RecordBatches from vortex-ffi crate. What do you think about it? I've attaching example PR.

[robert3005]

There's even an example in the repo on how to do it https://github.com/vortex-data/vortex/blob/develop/vortex-ffi/examples/scan_to_arrow.c

[ivagulin]

Oops. My workspace a bit outdated. Thanks!