[FIX] lunch: performance issue when retrieving lunch orders

- When retrieving lunch orders for specific users, the search could take a
  long time to be resolved.

  To fix this issue we rewrote the SQL View that retrieves the
  information for lunch orders.

closes odoo/odoo#32908

Signed-off-by: Denis Ledoux <beledouxdenis@users.noreply.github.com>