feat: add special uri scheme to use CloudFileReader for local fs

[chebbyChefNEQ]

This PR adds a new uri scheme, file-object-store to lance. When reading a file, we branch and use LocalFileReader if the object store is local. This is to reduce overhead and improvement performance of local datasets.

However, this makes local file system harder to test as it uses different code path for read. This new scheme will force local dataset use CloudFileReader so we can test behaviors unique to remote storage on local fs.

Note: doesn't work on window. but file:// doesn't work on windows anyways

[wjones127]

I'm about to add even more special case code paths, so this is a welcome change. I've been using the memory:// object store to test, but it is a pain to re-use across multiple sessions right now. Might be worth making that easier too.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.29630% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 79.72%. Comparing base (72b6715) to head (bfbb68c).

Files	Patch %	Lines
rust/lance-io/src/object_store.rs	85.71%	0 Missing and 1 partial ⚠️
rust/lance/src/dataset/scanner.rs	97.82%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2402      +/-   ##
==========================================
+ Coverage   79.70%   79.72%   +0.01%     
==========================================
  Files         200      200              
  Lines       54937    54988      +51     
  Branches    54937    54988      +51     
==========================================
+ Hits        43788    43838      +50     
+ Misses       8609     8607       -2     
- Partials     2540     2543       +3     

Flag	Coverage Δ
unittests	79.72% <96.29%> (+0.01%)	⬆️

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