Exposing latest netcdf 4.9.x library functionality: quantize, zstandard

[durack1]

The latest versions of libnetcdf include new functions to further squash data using lossy compression, see Charlie Zender: Why & How to Increase Dataset Compression in CMIP7 - in particular the quantize and zstandard operations.

How easy is it to expose this in CMOR 3.9?

ping @taylor13 @matthew-mizielinski @sashakames @piotrflorek @czender

Also see discussion https://github.com/PCMDI/cmor/discussions/724

[taylor13]

There is ongoing discussion on how Charlie Z's approach might get standardized under CF. See https://github.com/cf-convention/cf-conventions/issues/403. Not sure if the above is advocating that or not.