feat(image): Add compression and format effects for images

[BeneRoch]

This adds the possibility to compress images and turn to another format like this:

    {
        "type": "format",
        "format": "webp"
    },
    {
        "type": "compression",
        "quality": 70
    },
    {
        "type": "save",
        "copy": "{{filename}}.2000x000.{{extension}}.webp"
    }

Note that the saved file must include the new extension (in that case, .webp).

[charcoal-butler]

🎉 This PR is included in version 5.1.0 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀