Avoid loading scalar values automatically?

[TomNicholas]

unless there is a good reason not to load scalar values automatically.

I guess the only reason not to is that once zarr-developers/zarr-python#1977 is fixed (as it should be, else its a breaking change between v2 and v3) we will no longer need to load scalar values automatically, so we would be adding something to virtualizarr that we know we should remove later.

I think that's okay though - if you're happy to add a PR @ghidalgo3 we can think about what scenarios should cause a warning (or deprecation warning).

Originally posted by @TomNicholas in #194 (comment)

[TomNicholas]

Raising because zarr-developers/zarr-python#1977 was merged.