Add support for zstandard compression

[mathomp4]

I am hoping to build netCDF-C 4.9.0 and netCDF-Fortran 4.6.0 in Baselibs soon. In doing so, we have the capability to maybe try out zstd compression (see Unidata/netcdf-c#2173)

As such, I'll probably need to ask @bena-nasa to help me figure out how to get a new flag added to History so that I can test it out.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. If there are no updates within 7 days, it will be closed. You can add the "long term" tag to prevent the Stale bot from closing this issue.

[mathomp4]

Per @edwardhartnett, spack should be able to provide a zstandard-enabled netcdf-fortran.