[REF] stock: products on hand action

Instead of hardcoding a domain in the action, we add a field that will
be used to apply the domain. The goal is to be able to define a static
domain in the xml so we'll be able to default on the filter while still
being able to remove it.

Let's consider this usecase:

     Physical
    |        \
   WH    Subcontracting
    |         |
  Stock    5 units
    |
 10 units

With the hardcoded domain, we have two problems
- the right part of the tree isn't visible
- the user can add a quant in subcontracting but it will disappear at
  the creation since it isn't part of the hardcoded domain.

The complicated part of the domain is the `_get_domain_locations` call.
It will use multiple context keys, the current company and get the
hierarchy of internal locations below warehouses to see what it should
include or not.

To be able to remove a domain, it should be declared in the xml and not
hardcoded in the action. Since the domain is complex, we can't express
it. So we add a computed field "on_hand" and its search method is
overiden to call `_get_domain_locations`.

task-2061825

closes odoo/odoo#40403

Signed-off-by: Simon Lejeune (sle) <sle@openerp.com>

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