Added missing update and delete endpoints

With this iteration, we are bringing missing functionality for resources that already exist in API. We are adding update and delete functionality to several endpoints related to master data management:

• Product
  • PATCH /products
  • DELETE /products
• Material
  • PATCH /materials
  • DELETE /materials
• Variant
  • PATCH /variants
  • DELETE /variants
• Customer
  • PATCH /customers
  • DELETE /customers
• Customer address
  • POST/customer_addresses
  • PATCH /customer_addresses
  • DELETE /customer_addresses
• Supplier
  • PATCH /suppliers
  • DELETE /suppliers