Parallelize SAM algorithm in mineraly.py using Joblib

[aheermann]

Along with dask and Pytorch, we want another option for parallelization. This one is Joblib, a Python library often used for "embarassingly parallel for loops", that just runs on the CPU. The target code to parallelize is the same as issues #168 and #172, and this works to give users more choice when running Pycoal. Documentation on Joblib is linked below.
https://joblib.readthedocs.io/en/latest/index.html
https://joblib.readthedocs.io/en/latest/parallel.html

[lewismc]

Thanks @aheermann is there a PR for this yet?

[aheermann]

Not yet, @lewismc. I made a branch for the issue, but I am still making a few fixes