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GH-38648: [Java] Regenerate Flatbuffers (#38650)

### Rationale for this change

Regenerate the Flatbuffers to include new formats. Flatbuffers are always forwards/backwards compatible as long as the code is generated from the same `flatc` compiler version.

### What changes are included in this PR?

* Flatbuffers regenerated with `flatc` v1.12.0

### Are these changes tested?

Yes, via unit tests.

### Are there any user-facing changes?

Yes, RecordBatch.java was modified.
* Closes: #38648

Authored-by: Dane Pitkin <dane@voltrondata.com>
Signed-off-by: David Li <li.davidm96@gmail.com>