ipn/ipnstate: add AllowedIPs to PeerStatus

Adds AllowedIPs to PeerStatus, allowing for easier lookup of the
routes allowed to be routed to a node. Will be using the AllowedIPs
of the self node from the web client interface to display approval
status of advertised routes.

Updates #10261

Signed-off-by: Sonia Appasamy <sonia@tailscale.com>

ipn/ipnlocal/local.go

@@ -900,6 +900,10 @@ func peerStatusFromNode(ps *ipnstate.PeerStatus, n tailcfg.NodeView) {
 		v := n.PrimaryRoutes()
 		ps.PrimaryRoutes = &v
 	}
+	if n.AllowedIPs().Len() != 0 {
+		v := n.AllowedIPs()
+		ps.AllowedIPs = &v
+	}
 
 	if n.Expired() {
 		ps.Expired = true