[Feature] Spark: introduce columnarReaderFactory to support sending ColumnarBatch
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enhancement
- Dominant language
- Java
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Description
### Search before asking
- [X] I searched in the [issues](https://github.com/apache/incubator-paimon/issues) and found nothing similar.
### Motivation
Now, we use the vectorized reader to read data from parquet and orc but send the InternalRow to downstream one by one. For append-only tables or primary-key tables with full compaction, we can send ColumnarBatch to accelerating ser/deser.
### Solution
_No response_
### Anything else?
_No response_
### Are you willing to submit a PR?
- [ ] I'm willing to submit a PR!
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