feat: support image block extraction

[christinestraub]

Closes #306.

Summary

• pass extract_image_block_types param through api
• pass extract_image_block_to_payload param to unstructured library

  Testing

  $ pip uninstall unstructured
  $ git clone https://github.com/Unstructured-IO/unstructured.git & cd unstructured
  $ pip install -e .
  $ make run-web-app

• PDF

  curl -X 'POST' \
  'http://localhost:8000/general/v0/general' \
  -H 'accept: application/json' \
  -H 'Content-Type: multipart/form-data' \
  -F 'files=@sample-docs/embedded-images-tables.pdf' \
  -F 'strategy=hi_res' \
  -F 'extract_image_block_types=["Image", "Table"]' \
  | jq -C . | less -R

• Image

  curl -X 'POST' \
  'http://localhost:8000/general/v0/general' \
  -H 'accept: application/json' \
  -H 'Content-Type: multipart/form-data' \
  -F 'files=@sample-docs/embedded-images-tables.jpg' \
  -F 'strategy=hi_res' \
  -F 'extract_image_block_types=["Image", "Table"]' \
  | jq -C . | less -R

[awalker4]

Oh, actually, can you add the param to openapi.json as well? That will add it to the sdks when it gets merged.