[Java] Allow a user to provide an alternative "chunk" allocator

Right now, the Arrow Java libraries have two options:
- Have accounted memory using the Netty allocator.
- Have unaccounted memory using your own allocator.

I'd like to add a third option where you can use the existing accounting but decide where the chunks of memory come from.

**Reporter**: [Jacques Nadeau](https://issues.apache.org/jira/browse/ARROW-7198) / @jacques-n

_{**Note**: *This issue was originally created as [ARROW-7198](https://issues.apache.org/jira/browse/ARROW-7198). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*}

未指定檔案、測試或進入點。首先在 Arrow Java 程式庫中定位現有的基於 Netty 和使用者提供的 allocator 路徑，然後確定可設定的 chunk 來源如何保留記憶體記帳；當第三種配置選項能夠正常運作且不會遺失記帳時，即表示完成。

由索引模型根據 Issue 內容生成。