feat: Platform API improvements (#2900)

- Platform APIs to add and update custom attributes to users
- Platform APIs to delete accounts
- Platform APIs to delete users

swagger/definitions/request/user/create_update_payload.yml

@@ -9,4 +9,7 @@ properties:
   password:
     type: string
     description: Password must contain uppercase, lowercase letters, number and a special character
+  custom_attributes:
+    type: object
+    description: Custom attributes you want to associate with the user
 

swagger/definitions/resource/user.yml

@@ -19,6 +19,9 @@ properties:
     enum: ['agent', 'administrator']
   confirmed:
     type: boolean
+  custom_attributes: 
+    type: object
+    description: Available for users who are created through platform APIs and has custom attributes associated.
   accounts:
     type: array
     items: