Add check_duplicates and save_duplicates parameters to upload_from_url[_sync]

[evgkirov]

Support for check_URL_duplicates and save_URL_duplicates API parameters has been added when calling Uploadcare.upload_from_url or Uploadcare.upload_from_url_sync.

API: https://uploadcare.com/api-refs/upload-api/#tag/Upload/operation/fromURLUpload

Addresses #239

Usage example:

from pyuploadcare import Uploadcare

uploadcare = Uploadcare(public_key="YOUR_PUBLIC_KEY", secret_key="YOUR_SECRET_KEY")

# Raises FileAlreadyUploaded if duplicate (as we can't return FileFromUrl without a token).
# Returns FileFromUrl instance if not.
file_from_url = uploadcare.upload_from_url("https://source.unsplash.com/random", check_duplicates=True) 

# Always returns File instance (if upload is a duplicate it returns the old one).
file = uploadcare.upload_from_url_sync("https://source.unsplash.com/random", check_duplicates=True) 

• Should the universal Uploadcare.upload method have this feature as well? On one hand, it makes sense, but on the other hand, I didn't want it to become bloated.

Done

[rsedykh]

Can you bump up the version, and add this to the changelog?