Allow uploading zarr datasets

[frcroth]

URL of deployed dev instance (used for testing):

• https://___.webknossos.xyz

Steps to test:

• Upload zarr/ngff datasets as zip
• Upload a zip containing multiple zarr layers

TODOs:

• Upload of multiple layers in the same zip
• Frontend

Issues:

• fixes Allow uploading ZARR files #6205

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(Please delete unneeded items, merge only when none are left open)

• Updated changelog
• Considered common edge cases
• Needs datastore update after deployment

[fm3]

Cool stuff, code looks pretty good to me, and I tested a bunch, and most cases worked well. I added a couple of comments, especially about datasets with an existing datasource-properties.json file

[fm3]

Looking good :) Please see my question about guessed WKW vs Zarr

[fm3]

Am I reading this correctly that we guessed WKW but we still try to explore Zarr? This feels counterintuitive. Maybe the guessing code could be improved instead?

[fm3]

Nice trick with the maxDepth ;) (could you call it by name, with maxDepth=2 though? That way we may stumble less when reading this later)

Looks like the linter also sees an unused import still

Works for me!