doc: Add new command show bgp detail-routes

```
donatas-pc# show bgp all detail-routes

For address family: IPv4 Unicast
BGP table version is 11, local router ID is 192.168.10.17, vrf id 0
Default local pref 100, local AS 65002
BGP routing table entry for 10.0.2.0/24, version 1
Paths: (1 available, best #1, table default)
  Advertised to non peer-group peers:
  192.168.10.124
  65001
    192.168.10.124 from 192.168.10.124 (200.200.200.202)
      Origin incomplete, metric 0, valid, external, otc 65001, best (First path received)
      Last update: Tue Dec 20 12:11:52 2022
BGP routing table entry for 10.10.100.0/24, version 2
Paths: (1 available, best #1, table default)
  Advertised to non peer-group peers:
  192.168.10.124
  65001
    192.168.10.124 from 192.168.10.124 (200.200.200.202)
      Origin IGP, metric 0, valid, external, otc 65001, best (First path received)
      Last update: Tue Dec 20 12:11:52 2022
BGP routing table entry for 172.16.31.1/32, version 3
Paths: (1 available, best #1, table default)
  Advertised to non peer-group peers:
  192.168.10.124
  65001
    192.168.10.124 from 192.168.10.124 (200.200.200.202)
      Origin incomplete, metric 0, valid, external, otc 65001, best (First path received)
      Last update: Tue Dec 20 12:11:52 2022
```

Signed-off-by: Donatas Abraitis <[email protected]>

doc/user/bgp.rst

@@ -4325,6 +4325,17 @@ structure is extended with :clicmd:`show bgp [afi] [safi]`.
 
    If ``json`` option is specified, output is displayed in JSON format.
 
+.. clicmd:: show [ip] bgp [afi] [safi] [all] detail-routes
+
+   Display the detailed version of all routes. The same format as using
+   ``show [ip] bgp [afi] [safi] PREFIX``, but for the whole BGP table.
+
+   If ``all`` option is specified, ``ip`` keyword is ignored and,
+   routes displayed for all AFIs and SAFIs.
+
+   If ``afi`` is specified, with ``all`` option, routes will be displayed for
+   each SAFI in the selected AFI.
+
 .. _bgp-display-routes-by-community:
 
 Displaying Routes by Community Attribute