Changes to Update Outbound Contact Windows

added the new lead_call enum value to the windows/items/channel response property for the response status 200

added the new lead_call enum value to the request property windows/items/channel

added the optional property hours_follow_lead_timezone to the response with the 200 status

added the new optional request property skip_federal_holidays

added the optional property skip_federal_holidays to the response with the 200 status

endpoint added