feat: download scenes

[jo-mueller]

Fixes #507

Small PR that injects the from_ome_zarr and to_ome_zarr io pathway in the download utility function. This will probably be a good way to go for handling the download of other kinds of ome-zarrs as well.

I added the download function to the tests that are already in the scene tests, but in the long-term it will probably be good to have a suite of test data somewhere so we don't need to generate dummy data over and over again in the tests here.

Merging this could constitute another patch release?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.15%. Comparing base (1d38546) to head (8fee580).
⚠️ Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #648      +/-   ##
==========================================
+ Coverage   87.09%   87.15%   +0.06%     
==========================================
  Files          17       17              
  Lines        2518     2531      +13     
==========================================
+ Hits         2193     2206      +13     
  Misses        325      325              

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