Support exporting to WebP via the CLI

[marto55555]

• [x] I agree to follow the Code of Conduct that this project adheres to.
• [x] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Is your feature request related to a problem? Please describe. I'd like to export diagrams as WebP images via the command line interface, but it's currently only possible through the GUI. The CLI supports these formats only: pdf, png, jpg, svg, vsdx, and xml

Describe the solution you'd like draw.io.exe diagram.drawio -x -o image.webp to work

Additional context Exporting to WebP via the GUI was recently added: https://github.com/jgraph/drawio/issues/553

[m-mohamedin]

It's not possible to generate Webp images from electron https://github.com/electron/electron/issues/42034