issue instaling on new apple silicon

[arunpersaud]

Just installed becquerel on a new macbook pro with a M1 chip and ran into some issues with numba. It seems to be available via conda, but I was not able to just pip install it. In the end I cloned this git repo and just deleted the numba references before installing a local version.
I believe the main issue is that numba is hard to compile on M1 at the moment and there are issues (for example, numba/numba#6589).

Just wanted to post this here so that you can track it. Not sure if one can make numba an optional dependency, since I'm not sure how to make a decorator optional...