TensorFlow Serving meta and public endpoint

• enh: Provide meta information in response of webservice containing TF model name, Jetson model name, timestamp and duration in milliseconds
• enh: Provide make target make tensorflow-serving-predict-public showing access to public SSL endpoint on https://tensorflow-serving.polarize.ai provided via CloudFront -> K8s/Traefic loadbalancer -> K8s/service -> webservice on Jetson Node