[Java] Include compiled Flatbuffers sources in release artifacts

I'm seeing the flatc that's available in Maven foul up users because it depends on a version of glibc (2.14) which is too new for many enterprise Linux users. It would be better for the Arrow Java artifacts to not depend on flatc at all, if possible.

We could check the compiled sources into source control, but that seems less than ideal. Is there a clean way bundle them at packaging time?

**Reporter**: [Wes McKinney](https://issues.apache.org/jira/browse/ARROW-397) / @wesm

_{**Note**: *This issue was originally created as [ARROW-397](https://issues.apache.org/jira/browse/ARROW-397). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*}

Comece revisando a documentação de migração vinculada na issue e a configuração de empacotamento do Maven para os artefatos do Arrow Java. Confirme como o flatc está envolvido atualmente e defina um caminho em tempo de empacotamento para incluir fontes FlatBuffers compiladas sem exigir o flatc no momento do uso; considera-se concluído quando os artefatos de release não dependerem mais desse binário para essas fontes.

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