The goal of this commit is to add the possibility to define a <control>
in the arch of a kanban view. This works exactly like in the list view
arch. So we can add <create> and <button> that will be present when the
arch is used by an x2m in kanban view.
As a reminder, <control> allows you to add buttons to an x2m in list or
kanban view without js customization:
<create> allows to add a button allowing the creation of a record with
a different context
<button> allows to add a button action.
closesodoo/odoo#111307
Taskid: 3143419
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>