Feature Request: Add CC field to Web Widget

Based on https://support.zendesk.com/hc/en-us/articles/115009692388/comments/360002922733

Feature Request: 

Allow the ability to add a CC field to the Web Widget.

Use Case: 

We would like our end-users to be able to add CCs directly from the Web Widget ticket creation screen.

Issues:

Currently, there is no way for an end-user to CC another person when creating a ticket via the Web Widget. 

Description/Example/Use Cases/Proof of End-Users Requesting:

https://support.zendesk.com/hc/en-us/articles/115009692388/comments/360002922733