This commit adds a button to the `CallActionList` to signal to the other participants of the call that one is raising a hand. This will add a hand icon to the `CallParticipantCard` of the people with a raised hand and send a notification that is displayed in the `Call` view (only when in discuss, not in chat windows). task-3229507 closes odoo/odoo#116658 Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>