Add `!upload_image` WIP

[rockerBOO]

Note: this should work, but I couldn't get postgres working, so couldn't compile. Also, possible security issues since it downloads the file (with curl) right into a python script (rembg).

!upload_image URL will download the image, remove the background, and resize into a 256x256 image size (by the largest dimension, and keeping the aspect ratio).

Needs

• curl
• rembg in your path
• imagemagick (convert)

curl -s {} | rembg i > output.png
convert output.png -resize 256x256^ {}

[davidbegin]

thank you! I'll give this a test and then merge it in.