API Spec : https://docs.google.com/document/d/1N9LwrEgKEK4j4Cy4cCywVLxi217QAYjgbqfq4rB09nY
CBL-2974 Enhance pinned server cert to support matching with parent certs
CBL-3002 Implement enhanced pinned server certificate feature: Backport to 2.8.9