[v3] StoreTests[RemoteStore]

[d-v-b]

Attempts to specialize StoreTests with RemoteStore. Depends on #1785.

This is currently broken because I can't figure out the correct way to link up the s3 fixture with the StoreTests instance. Help would be appreciated!

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)

[d-v-b]

We are getting failures like this:

FAILED tests/v3/test_store/test_remote.py::TestRemoteStoreS3::test_get_partial_values[key_ranges3] - botocore.exceptions.HTTPClientError: An HTTP Client raised an unhandled exception: Task <Task pending name='Task-643293' coro=<_run_coros_in_chunks.<locals>._run_coro() running at /home/runner/.local/share/hatch/env/virtual/zarr/nOVTQ5-s/test.py3.11-1.24-optional/lib/python3.11/site-packages/fsspec/asyn.py:245> cb=[_wait.<locals>._on_completion() at /opt/hostedtoolcache/Python/3.11.9/x64/lib/python3.11/asyncio/tasks.py:519]> got Future <Future pending cb=[BaseSelectorEventLoop._sock_write_done(17, handle=<Handle BaseS....0.1', 5555))>)()]> attached to a different loop

cc @martindurant in case you have any insights here. This builds off #1785, but since I'm touching a lot of code here, I spun it out into a separate PR (and I opened a corresponding PR against your branch, which you can ignore if you would rather look here).

[jhamman]

Thanks @d-v-b for advancing this!