[REF] stock_account: average cost method with valuation layers

One of the goal of this refactoring is also to run the vacuum when the
cost method is AVCO. This will be used allow already out landed cost
on AVCO and also to have a consistent value when going into negative.

We update `_prepare_in_svl_vals` to set the remaining_qty field that
will be used when fifo is implemented. On the stock move, we create the
layer in with the real price unit of the move and adapt
product_price_update_before_done. This method will now compute the AVCO
according to the quantity valued in stock (quantity_svl) instead of all
the quantities in stock (qty_available), which was wrong (qty_available
could contain consigned quants).

We also make sure to recompute the avco when editing a done move.

We don't implement yet the negative handling as we'll need fifo for
that.

task-1875873

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