[integration] Wholesale API v2.7

The Wholesale API v2 has been updated with the following features:

• New endpoints to delete images:
  • Delete product images: DELETE/files/products/{model}/{fabric_code}/{image_index}
  • Delete fabric images: DELETE/files/fabrics/{fabric_code}
• New alternative endpoints to handle identifiers containing a "/" character ((with identifiers passed in JSON payload):
  
  • Delete product images: DELETE/files/products 
  • Delete fabric images: DELETE/files/fabrics 
  • Upload product images: POST /files/products 
  • Upload fabric images: POST /files/fabrics

Documentation is available here: https://lenewblack-wholesale.api-docs.io/2.7.0/