Why no bulk Arrow→Parquet write API in Java? How to avoid row-by-row RecordConsumer + optimize?

### Describe the usage question you have. Please include as many useful details as possible.

I have ~ 20KB objects that I need to write to Parquet efficiently from Java.
In C++, C#, and Python there's a direct/bulk Arrow-Parquet write (e.g. WriteTable / write_table) that avoids row-by-row iteration, but in Java I only see row-by-row paths via RecordConsumer or internal/unstable column writers.
Questions:
1. Is there a supported bulk/columnar Arrow-Parquet write API in Java (e.g, VectorSchemaRoot
→ Parquet) that avoids row-by-row calls?
2. If not, why is Java limited to row-by-row writes today? Any roadmap for feature parity with C++/Python/C#?
3. For now, what's the recommended optimization path to write 20KB objects at high throughput from Java (without JNI), or is JNI/Dataset the recommended route?
4. Any best practices (batch sizing, encodings, writer settings) to mitigate the row-by-row overhead?

Thanks

### Component(s)

_No response_

首先检查 issue 中提到的 Java 写入路径，尤其是 RecordConsumer、内部列写入器和 VectorSchemaRoot，然后将它们与针对 C++、C# 和 Python 描述的 bulk API 进行比较。完成的标准是记录是否存在受支持的 bulk Java 路径，说明当前的限制或 roadmap，并确定不使用 JNI 的推荐优化路径。

由索引模型根据 Issue 内容生成。