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Add support for ZEP8 URL syntax for store discovery and chaining of store adapters.

This feature introduces URL-based storage specification following ZEP 8: Zarr URL Specification, allowing users to specify complex storage configurations using concise URL syntax with chained adapters.

Key additions:

  • URL syntax support: Use pipe (|) characters to chain storage adapters, e.g., file:data.zip|zip
  • Built-in adapters: Support for file, memory, zip, s3, https, gcs schemes
  • Store adapter registry: New zarr.registry.list_store_adapters() function to discover available adapters
  • Extensible architecture: Custom store adapters can be registered via entry points

Examples:

# Basic ZIP file storage
zarr.open_array("file:data.zip|zip", mode='w', shape=(10, 10), dtype="f4")

# In-memory storage
zarr.open_array("memory:", mode='w', shape=(5, 5), dtype="i4")

# Remote ZIP file
zarr.open_array("s3://bucket/data.zip|zip", mode='r')

# 3rd-party store adapter (icechunk on S3)
zarr.open_group("s3://bucket/repo|icechunk", mode='r')