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.

从 ArrowVectorIterator::consume 和现有的 targetBatchSize 处理开始。确定 maxBufferSize 限制应如何与 record-batch 构建交互，然后为大型可变长度值定义测试；当迭代遵守内存限制且不需要超大 batch 时，即表示完成。

由索引模型根据 Issue 内容生成。