Allow import of 2D OME-Zarr data

[normanrz]

Detailed Description

If a dataset only has 2 space dimensions, wk should be able to import it. We even have optimized ui for datasets with depth=1.

[frcroth]

Seems to be already possible. The dataset https://uk1s3.embassy.ebi.ac.uk/idr/zarr/v0.4/idr0083A/9822152.zarr can be imported. When opening, the XY view automatically uses the entire viewport.
When clicking on YZ or XZ wk is very confused


Perhaps these buttons should be disabled by the frontend?

[frcroth]

I tested the sample datasets from https://idr.github.io/ome-ngff-samples/ here: https://docs.google.com/spreadsheets/d/1k3ObciCJ-7AevjROgX4QP3czPluYnNK3ySzwXC6rNnw/edit?usp=sharing

Datasets worked when they were version 0.4 and had a multiscales entry (instead of plate and wells).

[normanrz]

Did you find a non-plate dataset with just XYC axes? eg https://uk1s3.embassy.ebi.ac.uk/idr/zarr/v0.4/idr0076A/10501752.zarr

[frcroth]

I added the remaining datasets to the sheet. The mentioned dataset has all data in dtype double, which is not supported.
To import the dataset I had to adjust axisorder things, which I did on https://github.com/scalableminds/webknossos/tree/2d-datasets, however there does not seem to be a data set to test it on