When moving a product. We always do those operations:
- Search the quant for staring location
- Update it
- Search the quant for ending location
- Update it

However it's done for each `stock.move.line`.
So in case for example when you receive 10 000 serial numbers.
Their quant doesn't exist since they arrive in stock (main case,
exception could occurs). The system will be slow because it will
call search 10 000 * 2 to find some quants to update that doens't
exist yet.

In order to avoid a lot of useless queries. We do a more global search
on quants related to the selected moves and order them in a dict.
Later when we need them we just look in the dict values and pick them
from there.

closes odoo/odoo#146494

Signed-off-by: William Henrotin (whe) <whe@odoo.com>