test(Data): Add OME-NGFF testing data

Testing data downloaded via web3.storage.

Different channel order OME-NGFF from the first-instar-brain image
were generated with this notebook:

  https://gist.github.com/4654540b41fa9344b1ec1d60e61a8421

IDR data from:

  https://ome.github.io/www.openmicroscopy.org/2020/11/04/zarr-data.html

Also:

  https://github.com/ome/ome-ngff-prototypes

and:

  https://github.com/Kitware/itk-vtk-viewer/files/8532760/itk-vtk-viewer-demo-ome-zarr.ipynb.zip

.gitignore

@@ -27,4 +27,5 @@ src/IO/Downsample/web-build/itk-wasm-build-env
 src/Compression/blosc-zarr/web-build/*
 !src/Compression/blosc-zarr/web-build/BloscZarr.js
 !src/Compression/blosc-zarr/web-build/BloscZarr.umd.js
-!src/Compression/blosc-zarr/web-build/BloscZarr.wasm
+!src/Compression/blosc-zarr/web-build/BloscZarr.wasm
+test/data/