[OpenAI] Instructor for Batch Requests

[phatlast96]

Is your feature request related to a problem? Please describe.
Since OpenAI has a bulk feature now and I've been using Instructor's JSON formatting feature a lot, I'd love to combine those 2 since I've been hitting my rate rate limit on the number of requests.

Describe the solution you'd like
I would love use Instructor for JSON formatting of bulk requests. This would be beneficial since it's a lot of cost savings.

Describe alternatives you've considered
Continue hitting my rate limit using Instructor.

Additional context
Add any other context or screenshots about the feature request here.
https://community.openai.com/t/batchapi-is-now-available/718416

[CarloNicolini]

This feature should make instructor even more powerful. Having access to OpenAI batch requests allows a 50% discount. The API is something like this

from openai import OpenAI
client = OpenAI()

client.batches.create(
  input_file_id="file-abc123",
  endpoint="/v1/chat/completions",
  completion_window="24h"
)

Clearly there is some difference to be supported, but we'd all love the batch feature to be implemented by instructor ♥️