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GH-35033: [Java] [Datasets] Add support for multi-file datasets from Java (#35034)

I'd like to add support for multi-file datasets (in different directories) in the Java bindings.
This PR adds to the existing Datasets API to allow an array of URIs to be passed in. The logic for whether the URIs passed are valid or not exists in the JNI layer.
* Closes: #35033

Lead-authored-by: NoahFournier <fourniernoah6@gmail.com>
Co-authored-by: NoahFournier <63198198+NoahFournier@users.noreply.github.com>
Signed-off-by: David Li <li.davidm96@gmail.com>