BGP-LS advertisements of PCE delegated and initiated SRv6 TE tunnels

Report static Segment Routing for IPv6–Traffic Engineering (SRv6-TE) tunnels with static segment list with micro SID (uSID) configuration to Path Computation Element (PCE). When the PCE controller provisions an SRv6-TE tunnel with uSIDs, BGP-LS advertises the SRv6-TE tunnel with its uSID segment list. This feature supports the SID Structure TLV 1252 and the SRv6 endpoint behavior TLV 1250, which are now available in the PCE report. When the externally controlled and routed SRv6-TE receives a PCUpdate message with uSIDs from the controller, BGP-LS advertises the endpoint behavior of the uSIDs.