New Image Format: WEBP

[chescales]

Hi there! I'm opening this issue to see how many people would like this format to be added. I think it's gonna become common in the future, and we're already having problems in our site given some of our providers use this format for their images.

Currently, python-docx throws a very clear UnrecognizedImageError when trying to add a .webp image to a document.

Some info regarding it: https://developers.google.com/speed/webp/

Thanks a lot!

[scanny]

I expect the long wait will come from Microsoft Word accepting that format.

[abhishekbhakat]

Checking back again, 5 years since this was created 🤣.
It is still the same.

[abhishekbhakat]

Here is a PR #1423