support zero-sized chunks

[brokkoli71]

Enabling chunks of size zero and thus arrays of size zero

fixes #1977

TODO:

• Add unit tests and/or doctests in docstrings
• Add docstrings and API docs for any new/modified user-facing classes and functions
• New/modified features documented in docs/tutorial.rst
• Changes documented in docs/release.rst
• GitHub Actions have all passed
• Test coverage is 100% (Codecov passes)

[dcherian]

Is the shape (1, 0, 1) supported too?

EDIT: I see array([], shape=(3, 0), dtype=float64) in the issue.

Can you add min_side=0 to

zarr-python/src/zarr/testing/strategies.py

Line 68 in 6ce0526

array_shapes = npst.array_shapes(max_dims=4)

so that we get some more testing?

[brokkoli71]

@dcherian Yes, (1, 0, 1) is supported

[dcherian]

property tests fixed in scalableminds#4

[brokkoli71]

Thanks @dcherian ! I tried to think my way into the property tests. That helped a lot.