[IMP] product: extract pricelist item price computation into its model

The pricelist item model (product.pricelist.item) has a compute_price field,
and the necessary fields to be able to compute the price of a product.
However, these fields are never used into the model itself;
the parent model (product.pricelist) actually makes the computation,
embedded into _compute_price_rule.
Because of this, it's not possible to inherit pricelist items.
It's also a better design, on object principles.
Last, it lighten a method that is still 130+ lines long.

opw 2368733

X-original-commit: 9cd0bf740706a64e49599111304a6fb5ec6d7287

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