[12.0][IMP] product_contract: Implements parameter to define the quantity (one or sale_order_line.product_uom_qty)

[marcelsavegnago]

Implements parameter to define the quantity that should be used in the creation of a recurring contract.

[marcelsavegnago]

Another option would be to place this parameter on the product.

[github-actions[bot]]

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[rousseldenis]

@marcelsavegnago