discv5: Log enr URL at Besu startup

[usmansaleem]

Similar to enode: URL in the logs, Besu should also print enr: URL, specially if discovery v5 is enabled.

2026-03-05 08:35:09.575+1000 | main | INFO  | DefaultP2PNetwork | Enode URL enode://040cf6a04fbb65c12fb025a9cdb4737d41b108ff72f5e2b3d547c654eb45e42259a5ae46290e864f417eb2cbae771b8e6bb9373c5ba52fb2fbcb6135c432be93@127.0.0.1:30303
...

[Gabriel-Trintinalia]

admin_nodeInfo should also get enr

[macfarla]

enr in admin_nodeInfo -> #9969