Add IGP Router ID to ls_node_edge documents

[severindellsperger]

Problem Statement

Currently, the ls_node_edge collection lacks igp_router_id and remote_igp_router_id, identifiers that are available in other datasets like ls_prefix and ls_srv6_sid. Adding these IGP Router IDs into the ls_node_edge collection would simplify retrieving related information such as Prefix or SRv6 SID data.

Proposed Solution

Add the igp_router_id and remote_idp_router_id to the ls_node_edge.

Additional Context

I'm using the ls_node_edge collection to build a network graph in my app, where nodes are routers and edges are the connections between them. The calculation is triggered with a source and destination IPv6 address. Thus, I need the ls_prefix collection to identify the source and destination router that announces the source/destination networks where the IPv6 addresses are included. The calculation result should be transformed into a SID list. Thus, I also need the ls_srv6_sid.
Adding the igp_router_id and remote_igp_router_id directly in the ls_node_edge documents makes retrieving the related documents much more straightforward.

Do you agree that this would be handy? If so, I would create a PR.

[severindellsperger]

@brmcdoug mention for visibility.