feature: implement zarr's zep8 adapter for icechunk

[jhamman]

Combined with zarr-developers/zarr-python#3369, this allows Icechunk stores to be specified with a single string and passed to Zarr-Python and/or Xarray like this:

In [1]: import xarray as xr

In [2]: xr.open_zarr('s3://icechunk-public-data/v1/glad|icechunk:')

TODO:

• merge upstream PR in Zarr - feat: Implement ZEP 8 URL syntax support for zarr-python zarr-developers/zarr-python#3369
• write docs for this

closes #576

[jbusecke]

Hey @jhamman this looks really cool and I am very keen to test drive this. I was looking at the code and it seems for now the assumption that credentials are taken from the environment is hardcoded?

Do you think there will be a way to use the storage_options kwarg in zarr.open to pass other credentials, an in particular virtual container credentials?

[jbms]

Note: I have moved the URL pipeline proposal over from the ZEP repo to a separate repository:

https://github.com/jbms/url-pipeline