[IMP] base_action_rule: allow to use the CharDomain widget on base action rule, directly writing into a char field holding the predomain (condition) and domain (records to update)

- Task: https://www.odoo.com/web?#id=8119&view_type=form&model=project.task&action=333&active_id=131
- Pad: https://pad.odoo.com/p/r.ZtcqtozWUWn6eAnF