product_kit: Add option to set as kit

[sris-odoo]

Odoo Development Progress (2-Days Summary)

Odoo Product Kit Feature Development

Day 1: [Product Kit] Model Setup & Configuration

• Added a boolean field is_kit on product.template to mark products as kits.
• Introduced a Many2many field for assigning sub-products to a kit product.
• Made sub-product field conditionally visible only when is_kit is enabled.
• Laid the foundation for kit-based product structuring in the Sales module.

Day 2: [Product Kit] Wizard, Sale Order Handling & Reporting

• Added a "Configure Kit" button on Sale Order Lines for kit products.
• Button opens a popup wizard displaying all related sub-products.
• Made the button invisible if the product is not a kit or if the sale order is confirmed.
• Wizard allows editing sub-product quantities and unit prices.
• On confirmation, sub-products are added as separate sale order lines.
• Sub-product lines have price_unit = 0, and total price is rolled up to the main kit product.
• Added a "Print in Report" boolean field to the sale order.
  • If enabled, sub-products are shown in the invoice report and preview page.
• Implemented cascade delete: deleting the main kit product also removes its sub-products from the order.

[robodoo]

[dhrs-odoo]

Hello @sris-odoo given changes