In Memory Backend

[ianfd]

Hello everyone!

I'm currently working on a single cell rust library to build performant pipelines. Occasionally, it might be useful to have a pure in-memory representation of the data, instead of a H5 backed one. I tried implementing an in-memory backend on my own, but since I don't have that much experience with rust, I encountered some smaller problems.

I saw in the source-code that there was a prototype (maybe) there at one time anndata/src/backend/memory.rs, but it seems to be outdated.

Would it be possible to revive that project again? I know this is a lot of work, but it would really be handy to handle small or temporary data!

This is the current state of my attempt 😅. STATE