Consider adding fastice's grimpfunc and nisardev packages

[weiji14]

A few packages that may be useful to add for the Greenland Ice Sheet Mapping Project (GrIMP) - https://icesat-2-2023.hackweek.io/tutorials/GrIMP/GrIMP_tutorial.html

• https://github.com/fastice/grimpfunc
• https://github.com/fastice/nisardev

Currently only on GitHub and not PyPI/conda-forge, if someone is interested in packaging them up, that would make it easier to add to CryoCloud!