Why are these changes needed?

The ParquetDatasource currently does not persist information about the filesystem and unresolved paths, unlike the FileBasedDatasource. This PR aims to achieve greater coverage in collecting metadata about input data used in Ray by allowing ParquetDatasource to persist this information.

Changes implemented

• Added functionality to persist filesystem and unresolved path information for ParquetDatasource
• Aligned ParquetDatasource behavior with FileBasedDatasource for consistency
• Enhanced metadata collection for input data used in Ray

Benefits

• Improved data traceability and reproducibility
• Consistent behavior across datasource implementations
• Enhanced debugging and analysis capabilities

Checks

• I've signed off every commit(by using the -s flag, i.e., git commit -s) in this PR.
• I've run scripts/format.sh to lint the changes in this PR.
• I've included any doc changes needed for https://docs.ray.io/en/master/.
  • I've added any new APIs to the API Reference. For example, if I added a
    method in Tune, I've added it in doc/source/tune/api/ under the
    corresponding .rst file.
• I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
• Testing Strategy
  • Unit tests
  • Release tests
  • This PR is not tested :(