support batch processing

### Description

to reduce pricing, I think it's good to support batch process.

some models support that. how's your priority?

[anthropic batch process](https://docs.anthropic.com/en/docs/build-with-claude/batch-processing#message-batches-api)
[OpenAI Batch API](https://platform.openai.com/docs/guides/batch)

### References

_No response_