bgpd: Show internal data for BGP routes

Sometimes it's very useful to compare pointers from the gdb (and/or from the
logs) or just do some quick adhoc analysis.

```
donatas# sh ip bgp 1.1.1.0/24 internal
BGP routing table entry for 1.1.1.0/24, version 0
Paths: (1 available, no best path)
  Not advertised to any peer
  65002
    127.0.0.1 (inaccessible, import-check enabled) from 127.0.0.1 (127.0.0.2)
      Origin IGP, invalid, external
      Last update: Thu Jan 16 16:49:53 2025
      net: 0x63f3e6fc2ea0, path: 0x63f3e6fc2f50, pathext: 0x63f3e6faed00, attr: 0x63f3e6e8c550
      flags net: 0x0, path: 0x1024, attr: 0x7
donatas#
```

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>

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