[IMP] *: introduce data-hotkey on form and modal views

Define `data-hotkey` on most used action buttons.

For the modals, the following keys are dedicated for "special"
actions:
 - Alt+G: add
 - Alt+V: save
 - Alt+Z: cancel

closes odoo/odoo#73275

Taskid: 2588233
Related: odoo/enterprise#19464
Signed-off-by: Kevin Baptiste <kba@odoo.com>