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