Minimal example of communication between AnyWidget and Zarr store to load data

[keller-mark]

Based on the Vizarr widget created by @manzt , this is an example of loading array data using Zarr (zarr-python on Python side and zarrita.js on the JS side): https://gist.github.com/keller-mark/b19c16434123b3b8cfbc05c8cd542f8e

[manzt]

Thanks for sharing! I've been wondering if we could move send into a small utility library.