[IMP] mrp: added support embedded google slide on work center

This commit adds new `embed_viewer` widget which will be used display URLs
via embedded iframes.  You can add any valid URL to display page via iframe,
although widget automatically converts raw google slide URL into embedded URL.

Task ID: 1909010

closes odoo/odoo#29404

Signed-off-by: Simon Lejeune (sle) <sle@openerp.com>


Co-authored-by: pga-odoo <pga@odoo.com>