should control the maximum memory usage

### Describe the enhancement requested

`ArrowVectorIterator::consume` only concern about the `ArrowVectorIterator#targetBatchSize` but not the memory used.

Let's suppose a scenario:
1. A database table with a longtext field;
2. All of the rows in the table are larger than 500M;
3. `ArrowVectorIterator#targetBatchSize` is 256;

We need at least for 125G memory to get one record batch.

So I think it's better add a parameter such as `maxBufferSize` to control the memory usage.

從 ArrowVectorIterator::consume 和現有的 targetBatchSize 處理開始。確定 maxBufferSize 限制應如何與 record-batch 建構互動，然後為大型可變長度值定義測試；當迭代遵守記憶體限制且不需要過大的 batch 時，即表示完成。

由索引模型根據 Issue 內容生成。