Reuse file descriptors for LocalFileSystem object storage

### Is your feature request related to a problem or challenge?

The ObjectStore implementation is stateless and doesn't allow for passing `File` descriptors.
This means for every request it's doing a `File::open` (and close) call, which creates overhead (mainly when doing a lot of small requests, e.g. with predicate pushdown enabled).

### Describe the solution you'd like

Implement an object store implementation for DataFusion that opens / reuses the `File`s for each path.

We can use `Arc` stored in hashmap for each file / path + read_at (stateless file read) to minimize overhead and maximize concurrency.

### Describe alternatives you've considered

_No response_

### Additional context

Also see

https://github.com/apache/arrow-rs-object-store/issues/622
https://github.com/apache/arrow-rs-object-store/issues/614

Start with DataFusion's ObjectStore and LocalFileSystem entry points, then review the linked arrow-rs-object-store issues #622 and #614 for related constraints. The work is complete when LocalFileSystem reuses open File descriptors per path while preserving concurrent stateless reads and avoiding an open/close cycle for every request.

Written by the indexing model from the issue text.