Possible autoray integration

[dcherian]

I'm opening this issue for discussion really.

I stumbled on autoray (Github) by @jcmgray which provides an abstract interface to a number of array types.

What struck me was the very general lazy compute system. This opens up the possibility of lazy-but-not-dask computation.

Related: #2298 #1725 #5081

[jcmgray]

Oh happy to answer any questions you might have, I'll just note there are also proper docs for the lazy computation stuff here now - https://autoray.readthedocs.io/en/latest/lazy_computation.html.