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GH-42101: [Java] Create File for Output Validation in FileRoundtrip (#42115)



### Rationale for this change

Enhance the logic to ensure that the output directory and file are created if they do not exist. While the input directory and file are mandatory, the output directory and file might not exist.

### What changes are included in this PR?

- [x] Create file if output directory or file does not exist.
- [x] Add unit tests
  - Test with different directories to validate creation of non-existent directory
  - Test for non-existent input file

### Are these changes tested?

Yes. Additional unit tests have been added.

### Are there any user-facing changes?

Maybe. Yes.

* GitHub Issue: #42101

Authored-by: Hyunseok Seo <hsseo0501@gmail.com>
Signed-off-by: David Li <li.davidm96@gmail.com>