[FIX] product, decimal_precision, stock, mrp: Prevent quant reservation issue

One can set a Unit of Measure precision rounding more
precise than the overall Decimal Accuracy. This can trigger the error
'It is not possible to unreserve more products', as there will be
inconsistencies on reserved quantities due to decimal roundings.
We add 2 warnings on Units of Measure and Decimal Accuracy.
Therefore, users are warned when their UOM/decimal changes can
cause inconsistencies in quants reservation.

Also, we want to prevent the issue at the root by ensuring that both the move
and the quant have the same reserved quantity.
The contrary can happen e.g. when a product is defined in Liters (rounding .001)
but used in an operation in ml (rounding .01, so e.g. 187.5ml).
The conversions between the 2 UOM can cause the differences of reservations.

In _prepare_move_line_vals we make sure uom_quantity_back_to_product_uom
is not more precise than the overall Decimal Accuracy. That way, if
the reserved quantity changes between UOM conversions, the move line created
is in the quant/product UOM, and we do not have move line's reserved quantity >
quantity in stock.
We do the same for _update_reserved_quantity (stock.move), when updating
a move line.

In _update_move_lines, because of UOM conversions, new_quantity_done
can differ from ml.product_uom_qty, which triggers the creation of an extra
move line, leading to reserved quantity > quantity in stock. To prevent
that, we compare the reserved quantities in the product UOM.

opw 2206902 (Example 1)
opw 2171541
opw 2221227
opw 2233937
opw 2198775
and many more

closes odoo/odoo#61758

X-original-commit: 91318520314632655127142de674156802214a21
Signed-off-by: Arnold Moyaux <amoyaux@users.noreply.github.com>

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