[ADD] approval_sales: Implemented Cost Margin Approval and Final Pric…

[jodh-odoo]

…e Submission

• Added a new 'Create Sale's' approval type with fields for Cost Price, Margin, Unit Price, Quantity, Product, Custom Margin, and Final Price.
• Disabled the 'Confirm' button on quotations until final approval is granted.
• Added a 'Submit Final Price' button to reflect approved unit prices in sale order lines.
• Ensured proper tracking and logging of changes for audit purposes.
• Enhanced visibility and field state management using readonly, editable, and conditional fields.