Add peer groups support for network routes (#1150)

This commit enhances the functionality of the network routes endpoint by introducing a new parameter called `peers_group`. This addition allows users to associate network routes with specific peer groups, simplifying the management and distribution of routes within a network.

management/server/account_test.go

@@ -1385,8 +1385,9 @@ func TestAccount_Copy(t *testing.T) {
 		},
 		Routes: map[string]*route.Route{
 			"route1": {
-				ID:     "route1",
-				Groups: []string{"group1"},
+				ID:         "route1",
+				PeerGroups: []string{},
+				Groups:     []string{"group1"},
 			},
 		},
 		NameServerGroups: map[string]*nbdns.NameServerGroup{