[Feature]Add subcommand --version (#166)

* add subcommand --version

* fix

* lint

Co-authored-by: wuhua.ck <wuhua.ck@alibaba-inc.com>

ray-operator/main.go

@@ -44,7 +44,7 @@ func main() {
 	flag.BoolVar(&version, "version", false, "Show the version information.")
 	flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
 	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
-	flag.BoolVar(&enableLeaderElection, "enable-leader-election", true,
+	flag.BoolVar(&enableLeaderElection, "enable-leader-election", false,
 		"Enable leader election for controller manager. Enabling this will ensure there is only one active controller manager.")
 	flag.IntVar(&reconcileConcurrency, "reconcile-concurrency", 1, "max concurrency for reconciling")
 	flag.StringVar(