Allow third parties services to contact a base_automation via the route "/web/hook/<uuid>"
Base Automations now have an additional field "record_getter", which contains a python expression
that should return a record set on which the webhook will apply.
A base automation configured as a webhook takes in its eval_context, the "payload", that is, a shortcut
to the request's data.
task-id-3450200
Part-of: odoo/odoo#135932
Co-authored-by: Damien Bouvy <dbo@odoo.com>
