Hide inactive employees
On #4435 we added the start and end date on the employee, but we did not add active field on it. Now, the employee is used as [assignation of multiple records](https://foss.heptapod.net/tryton/tryton/-/blob/08779343f15d8d37b859218172796e01692ac1db/modules/company/model.py#L46) but there is no date restriction on such fields. So I'm wondering if won't be easier to add the `active` field computed with a context date on all fields, instead of adding the domain on all fields. Note that there was a long discussion on related issue, so before doing anything we must ensure that the proper design is right.
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