bgpd: Implement Node Target Extended Communities

kttps://datatracker.ietf.org/doc/html/draft-ietf-idr-node-target-ext-comm

unet> sh r1 vtysh -c 'sh ip bgp nei 192.168.1.2 adver'
BGP table version is 1, local router ID is 192.168.1.1, vrf id 0
Default local pref 100, local AS 65001
Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

    Network          Next Hop            Metric LocPrf Weight Path
 *> 10.10.10.10/32   0.0.0.0                  0         32768 i

Total number of prefixes 1

unet> sh r1 vtysh -c 'sh ip bgp nei 192.168.1.3 adver'
BGP table version is 1, local router ID is 192.168.1.1, vrf id 0
Default local pref 100, local AS 65001
Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

    Network          Next Hop            Metric LocPrf Weight Path
 *> 10.10.10.10/32   0.0.0.0                  0         32768 i

Total number of prefixes 1

unet> sh r2 vtysh -c 'show ip bgp 10.10.10.10/32'
% Network not in table

unet> sh r3 vtysh -c 'show ip bgp 10.10.10.10/32'
BGP routing table entry for 10.10.10.10/32, version 1
Paths: (1 available, best #1, table default)
  Advertised to non peer-group peers:
  192.168.1.1
  65001
    192.168.1.1 from 192.168.1.1 (192.168.1.1)
      Origin IGP, metric 0, valid, external, best (First path received)
      Extended Community: NT:192.168.1.3 NT:192.168.1.4
      Last update: Tue Apr 11 23:19:33 2023

unet>

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

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