This commit adds a new snippet option allowing the user to choose one of
a series of SVG shapes as their background, or to be overlaid over the
background image of a snippet and to customize the colors of those
shapes.
Part of https://github.com/odoo/odoo/pull/53017
task-2210790
closesodoo/odoo#53017
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>
