[IMP] stock: Add hybrid procure method 'mts_else_mto'

In some occasions, products can be available in a location,
but are still ignored when the MTO is set on those products.
(e.g.: When a product is returned)

To avoid this, we add a `procure_method` named `mts_else_mto`,
allowing procurement to reserve the products if enough of them
are available in his source location.
In order to achieve this,  we apply the MTS or the MTO `procure_method`
on the moves from the procurement depending on whether or not there are
enough quantities of the needed products in the source location
('All or nothing' logic).

Quick performance test:

With a Sale Order of 800 differents products set as MTO+Buy,
Half of these products available in stock.
Before the patch :
2m30s to confirm the SO (800 PO Lines created)

After the patch:
MTO (procure method MTO):
2m30s to confirm the SO (800 PO Lines created)
MTO (procure method MTS_ELSE_MTO):
2m26s to confirm the SO (400 PO Lines created)

TaskID: 1831347

closes odoo/odoo#32778

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

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