issues

What happened:

On 0.16.2 and later, passing a non-HTTPS remote URL path (e.g. gs://...) as input to open_zarr() results in a KeyError or GroupNotFoundError:

```python

import xarray as xr xr.open_zarr("gs://cmip6/AerChemMIP/AS-RCEC/TaiESM1/histSST/r1i1p1f1/AERmon/od550aer/gn/", consolidated=True) KeyError: '.zmetadata' xr.open_zarr("gs://cmip6/AerChemMIP/AS-RCEC/TaiESM1/histSST/r1i1p1f1/AERmon/od550aer/gn/", consolidated=False) GroupNotFoundError: group not found at path '' ```

What you expected to happen:

With versions 0.16.1 and earlier, passing a non-HTTPS remote URL path to open_zarr() as input would successfully open the remote store, provided that a package to handle the specific filesystem was available in the environment and the proper storage options were supplied.

Minimal Complete Verifiable Example:

Same as above, but with decode_times=False to circumvent a cftime dependency:

```python import xarray as xr

xr.open_zarr( "gs://cmip6/AerChemMIP/AS-RCEC/TaiESM1/histSST/r1i1p1f1/AERmon/od550aer/gn/", consolidated=True, decode_times=False, ) ```

Anything else we need to know?:

From a brief debug of the code, it looks like this error is a result of open_zarr() now calling open_dataset(engine="zarr") to open the Zarr store.

In this function, the remote URL path is now passed through _normalize_path() where it is not recognized as a remote URL (this check is done by is_remote_uri() which only checks for HTTPS) and is instead interpreted as a relative path in the local filesystem, where it does not exist.

I'm not sure if this meant to be expected behavior, as the documentation on reading datasets in the cloud does not show an example using a URL path as input, and only suggests to use a MutableMapping. However, this is a use case that worked before 0.16.2, and now no longer works.

I think this could be resolved by expanding is_remote_uri() to check for other common remote URIs (e.g. gs:, s3:, etc.).

Environment: