Updates to ROI loader

[jluethi]

TODO:

• Add option to load as numpy array, not as dask array (what should the default be? How should it be exposed to the user?)

Tests:

• Add tests for new functions in OMEZarrImage: get_omero_metadata
• also add unit test for read_table in OMEZarrImage
• Add tests for ROILoader Widget

[jluethi]

@fdsteffen I have a prototype ready for the ROI loader for our meeting on Thursday. Still some cleanup needed, but it now has the core functionality of loading intensity images, labels & ROIs.

I will want to:

1. Expose option to force layers to be loaded as numpy arrays (non-lazily)
2. Add a thread worker for the run function in case loading is slow (or some other method to not freeze the main thread)

And we should then discuss on Thursday how the 2 parts come together! :)

[fdsteffen]

Sounds great, looking forward!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 19.75309% with 65 lines in your changes are missing coverage. Please review.

Please upload report for BASE (main@b1b5f69). Learn more about missing BASE report.

Files	Patch %	Lines
src/napari_ome_zarr_navigator/roi_loader.py	9.52%	57 Missing ⚠️
src/napari_ome_zarr_navigator/ome_zarr_image.py	55.55%	8 Missing ⚠️

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  Files           ?       14           
  Lines           ?      785           
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