[IMP] product, purchase: allow to set vendor prices on specific variant

- Show Product(product.supplierinfo) field when product has more than one variants.
- Improve tooltip on Product(product.supplierinfo) and 'Cost'(product.template) fields.
- Hide 'Cost'(product.template) field when product has more than one variant

Purpose
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1. There is some confusion between the vendor price and the cost price of a product. The goal of this task is to clarify it for users.
2. Some users would like to set up vendor prices specific to a variant, the goal of this task is to allow them to do that.

Specification
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- Add a clear tooltip on the Cost field (standard_price) : "The cost price is used to valuate your inventory."
- When creating variants, it is impossible to set the cost of the product variant, it always resets to 0. It should be hidden if the product has some variants
- Add product_id o2m in vendors form, tree view on product template, and same field should be displayed on variant form view (the field is not required)
- Product_id field visible only when product has more than one variant
- Add a tooltip on this field : "If not set, the vendor price will apply to all variants of this products."
- Vendor price calculation for automated generated RFQ (should be based on sequence: take the first vendor price that matches all the conditions)

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