feat: setup return render function, and upgrade deps to @vue/reactivity 3.4

[lyonbot]

Description

• setup can return render function
• fix lagging bug when syncing props
• update examples and dev dependencies
• update requirement version of @vue/reactivity to 3.4

Linked Issues

close #13

Additional context

maybe we can remove all legacy code in "watch" now? since "Scope" can handle many scenarios.