[IMP] web_editor: add new way to toggle left panel widget visibility

Now, instead of extending updateUI, developers can extend
_computeVisibility and _computeWidgetVisibility to indicate if the
whole option or a specific widget needs to be visible or not.

Without any JS, developers can also add a 'data-dependencies' attribute
on widgets whose value is a comma-separated list of widget names. Widget
names are specificied through 'data-name'.

Other notable changes:

1) *All* the options UI of a same section are updated on a change (not
   only the widgets of the same option).

2) Back as it was before: the UI is only updated in non-preview mode
   (prevent flickering of background removal during color preview
   because of point 1).

Part of https://github.com/odoo/odoo/pull/41600

closes odoo/odoo#41600

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

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