test numba to speed up `convert_to_python=True`

[martinjrobins]

Summary

Might be faster using convert_to_python if we use numba to compile it....? would help with the idklu solver. The other option to speed this one up is #1863. But this is easier so I want to give this one a go first

Motivation

Trying to speed up the ida solver so we can use its superior event handling

[martinjrobins]

info on sparse matrix support for numba: https://github.com/numba/numba-scipy/issues/29

[martinjrobins]

could try this: http://csr.lenskit.org/en/stable/

[kratman]

@martinjrobins Is this relevant anymore?

[github-actions[bot]]

It looks like there hasn't been a reply in 30 days, so I'm closing this issue.