Add a many2one on the landed cost to the vendor bill. Allow to create a
landed cost from a vendor bill if the product is a service. It will use
the price_subtotal of the account move line. Add a is_landed_costs_line
to separate products of landed costs on the account move line. It's a
checkbox. Ticking the checkbox will change the account of the account
move if the company is in anglo saxon accounting.

Tweak the accounts used by the landed costs so that everything is well
balanced (see the added tests). Auto reconcile AML when possible.

task-59011