Add SVG optimizer

[rgaudin]

As we're seeing SVG as source images in scraper source, it'd good to have an SVG optimizer/cleaner. Probably lossless only at this point.

• svgo probably most popular (node)
• scour (python)
• svgcleaner cleaning-only (rust)

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be now be reviewed manually. Thank you for your contributions.