[MIG] membership: migrate to new api,

- Split compute function in res.partner into 4 functions as they no more share the same dependencies
- removed dead constraint from 'membership.membership_line' model. That constraint checks if the invoice's date
  is greater than membership line's date but the membership line is created before the draft invoice is created
  (and that too without date set), hence it can't be raised.(Though, it can be raised if we check it on 'state' field).

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