Support more types, and support dask.

[adamltyson]

Moving issue from https://github.com/brainglobe/cellfinder/issues/184

Imio should read more types with an option to return a dask array rather than numpy.

Some ideas include:

• [x] Path to directory of tiffs
• [x] Path to text file of tiffs
• [x] 3D tiff
• [ ] h5/BDV
• [ ] npy
• [ ] OME-Zarr

[adamltyson]

This has progressed very slightly with https://github.com/brainglobe/brainglobe-utils/pull/73. At some point, read_z_stack and read_with_dask should be combined with load_any etc. I didn't do it in https://github.com/brainglobe/brainglobe-utils/pull/73 because there's already enough downstream effects of that PR.