Add support email_ccs property at create ticket api

[staust]

It would be nice to add support for email_ccs property at create ticket api endpoint.
https://developer.zendesk.com/documentation/ticketing/managing-tickets/creating-and-updating-tickets/#setting-email-ccs

Currently only email_cc_ids is supported which requires to be known users to zendesk. With the email_ccs property it is possible to add unknown/new email contacts to tickets which is especially useful for out bound contacts, like in their example:

{
  "ticket": {
    "email_ccs": [
      { "user_id": "562624", "action": "put" },
      { "user_id": "243642": "action": "delete" },
      { "user_email": "else@example.com", "user_name": "Someone Else", "action": "put"}
    ]
  }
}

The current workaround is to use the generic POST capability of the library to create tickets including those properties.