Add tabbed carousel example (pull #1120)

To resolve #955, adds an example of a carousel that uses the tabs pattern as carousel controls.

Co-authored-by: Matt King <a11yThinker@Gmail.com>
Co-authored-by: Scott Vinkle <scott.vinkle@shopify.com>
Co-authored-by: Valerie Young <valerie@bocoup.com>
Co-authored-by: Carolyn MacLeod <Carolyn_MacLeod@ca.ibm.com>
Co-authored-by: Sarah Higley <sarah.higley@microsoft.com>