Multiple context managed by a load balancing technique

[anzalabidi]

iso := v8.NewIsolate()
	defer iso.Dispose()
	if iso == nil {
		log.Fatal("Failed to create V8 isolate")
	}
	v8Ctx := v8.NewContext(iso)
	defer v8Ctx.Close()

	_, err = v8Ctx.RunScript(backendBundle, "bundle.js")
	if err != nil {
		log.Fatalf("Failed to evaluate bundled script: %v", err)
	}
	val, err := v8Ctx.RunScript(fmt.Sprintf("renderApp(%s)", string(propsJSON)), "render.js")
	if err != nil {
		log.Fatalf("Failed to render React component: %v", err)
	}

Need to make this usable via context pool.