feat: Support mutifile & multiscale OME-TIFF

[manzt]

Extends on #740

This release PR Viv's multifile OME-TIFF data-loading capabilities to multiscale TIFFs as well. The loadOmeTiff utility now recognizes and loads multiresolution images described in a companion.ome metadata file.

The API stays the same for end users. Multifile OME-TIFFs are detected from URLs with path suffixes of *companion.ome.

import { loadOmeTiff } from '@vivjs/loaders';

let loader = await loadOmeTiff("http://localhost:8080/data.companion.ome");