merging eigenstrapping with neuromaps

[nikitas-k]

Hello,

I am the lead author on the eigenstrapping preprint: https://www.biorxiv.org/content/10.1101/2024.02.07.579070v1

I'd like to request its addition to the neuromaps package as a null method - you can find eigenstrapping here. I've made my best attempt to integrate it with the existing neuromaps.nulls functionalities, though there are some idiosyncrasies with the dependencies (particularly with netneurotools, the update to the scipy libraries. more testing fully needed. Maybe this could be part of a development branch of neuromaps until the kinks can be ironed out.

Thanks.