feat: Support for URL convert

[jiaweing]

Added support for converting URLs natively supported by Docling
https://ds4sd.github.io/docling/examples/minimal

source = "https://arxiv.org/pdf/2408.09869"  # document per local path or URL
converter = DocumentConverter()
result = converter.convert(source)
print(result.document.export_to_markdown())
# output: ## Docling Technical Report [...]"

Request:

curl --request POST \
  --url http://localhost:8080/documents/convert \
  --header 'Content-Type: multipart/form-data' \
  --header 'accept: application/json' \
  --form extract_tables_as_images=true \
  --form image_resolution_scale=4 \
  --form url=https://jiaweing.com

Either document or url param needs to be populated.

[archasek]

@jiaweing can you merge please?

[haoruilee]

@jiaweing can you merge please?

[archasek]

@jiaweing https://github.com/docling-project/docling-serve :-)