[IMP] web_editor, website, *: create background-type toggler option

*: website_blog

Previously, background colors, images, and videos could all be applied
on the same section, such that the image can be used as a fallback for
the video, and the color as a fallback for the image. However, if you
wanted to change the background color behind the background image, the
background image would be removed. The background image and background
video also shared the same widget to pick the image or video.

This commit adds a background-type toggler, where the user can toggle
the background color, image and video individually. It also makes the
video picker into its own UserValueWidget, such that the user can pick
both an image and video without overriding the other.

Part of https://github.com/odoo/odoo/pull/53017
task-2210790

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