Need Supplier for Product

[willatkova]

It is not necessary for Category, Brand and Supplier for each product. Only need Supplier.

[willatkova]

ToDo

• [x] Model
• [x] Python API
• [x] DB Table
• [x] Bloc
• [x] Import from Product Spreadsheet
• [x] Create Supplier if needed
• [x] Create ProductSupplierLink if needed
• [x] Upload to API
• [x] Download from API

[willatkova]

Ready for Testing