MPLS egress traffic statistics for label IS-IS routes at ingress device

Currently, sensors are available for collecting segment routing statistics for MPLS transit traffic, which is MPLS-to-MPLS in nature. Additional sensors are introduced to collect segment routing statistics for MPLS egress traffic at the ingress provider edge (PE) device, which is IP-to-MPLS in nature. With this feature, you can enable sensors for label IS-IS segment routing egress traffic only, and stream the statistics to a gRPC client.