Crossover with DataTree

[TomNicholas]

Hi there, I just wanted to draw your attention to the DataTree class I'm working on over in this repo. This kind of "image pyramid" is a use case I would like to help support, but I'm not totally sure how much our two packages will cross over, if at all.

[d-v-b]

Thanks for the pointer! I'm excited about DataTree and I'm strongly considering adding DataTree as a dependency for some downstream code that uses xarray-multiscale, and if that works out I might move it up into xarray-multiscale itself.