refactor: add store_prefix to lance-io's ObjectStore

[cmccabe]

Add the store_prefix to lance-io's ObjectStore. This is helpful when caching ObjectStore objects, so that we can tell which ones map to the same data.

[chatgpt-codex-connector]

Codex usage limits have been reached for code reviews. Please check with the admins of this repo to increase the limits by adding credits.
Credits must be used to enable repository wide code reviews.

[westonpace]

This seems reasonable to me. This object is somewhat indecisive between using public properties (list_is_lexically_ordered, use_constant_size_upload_parts) and accessors (block_size, max_iop_size) so I guess both approaches are fine 😆

[Xuanwo]

Seems tests case around the following failed, maybe worth another look, cc @cmccabe

failures:
    scheduler::tests::test_backpressure
    scheduler::tests::test_priority

[cmccabe]

Should be fixed now. I added a fallback path for object stores that aren't in the registry but that's we're "wrapping" via the deprecated API. For those we have to guess the storage prefix, unfortunately, since nothing can tell us about it. It should be OK to just use scheme+authority there.

[codecov]

Codecov Report

❌ Patch coverage is 58.33333% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
rust/lance-io/src/object_store.rs	54.54%	5 Missing ⚠️

📢 Thoughts on this report? Let us know!