Export dataset

[will-moore]

This PR replaces #83 for export of a Dataset from OMERO:

$ omero zarr export Dataset:1

This will create a top-level group, named after the Dataset ID: 1.zarr
The group metadata lists images using their name as a path:

"collection": {
  "images": {
    "image_name1.tiff": {},
    "image_name2.tiff": {}
  }
}

NB: as noted on PR above, some characters in image names break this, e.g. /, [, ] so need to handle them.

Recent test export using commit 8dc4707 below is hosted at https://minio-dev.openmicroscopy.org/idr/v0.3/datasets/idr0043/13901.zarr and can be viewed in vizarr but it not very reliable (see hms-dbmi/vizarr#124 (comment))

[joshmoore]

I assume this is closed waiting on ome/ngff#67? It might be interesting to try the strategy here with the OME-XML from ome/ngff#104

[will-moore]

Try an OME-XML strategy from the bioformats2raw export? Or generate OME-XML via python? Not sure what "the strategy" means here?

[joshmoore]

I meant generate OME-XML from this plugin to match the specs in 104 which tie multiple images together into a single collection.