bgpd: Show conditional advertisement timers in neighbor CLI output

bgpd: Show conditional advertisement timers in neighbor CLI output

```
spine1-debian-11# sh ip bgp neighbors 192.168.0.1
BGP neighbor is 192.168.0.1, remote AS 65001, local AS 65000, external link
Hostname: exit1-debian-11
  BGP version 4, remote router ID 192.168.10.123, local router ID 192.168.100.1
  BGP state = Established, up for 00:00:32
  Last read 00:00:30, Last write 00:00:30
  Hold time is 180, keepalive interval is 60 seconds
  Configured conditional advertisements interval is 5 seconds
  Time until conditional advertisements begin is 4 seconds
```

```
    "bgpTimerConfiguredConditionalAdvertisementsSec":5,
    "bgpTimerUntilConditionalAdvertisementsSec":1,
```

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