[ADD] product_attribute_value_price_formula

[SirAionTech]

No description provided.

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[SirAionTech]

Rebased on 16.0.

[rousseldenis]

Suggested change

	ptav_formula_extra_price = fields.Float(
	product_template_attribute_value_formula_extra_price = fields.Float(

Explicit is better than implicit

[SirAionTech]

Thanks for having a look!
I know, but ptav looked like a familiar acronym to me since it's already used throughout Odoo's codebase, for instance https://github.com/odoo/odoo/blob/9e774cf88398b7ffc701c4adf44451e39963db08/addons/website_sale/tests/test_website_sale_reorder_from_portal.py#L45-L47

        ptavs = no_variant_template.attribute_line_ids.product_template_value_ids
        ptav_s = ptavs.filtered(lambda ptav: ptav.product_attribute_value_id == s)
        ptav_l = ptavs.filtered(lambda ptav: ptav.product_attribute_value_id == l)

Anyhow, I changed it

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