Using the vue watch options

[Gumball12]

This module needs to be able to use the WatchOptions provided by Vue watch.

{
  watch: {
    handler: Function;

    // Vue `WatchOptions`
    immediate?: boolean // default: false
    deep?: boolean // default: false
    flush?: 'pre' | 'post' | 'sync' // default: 'pre'
    onTrack?: (event: DebuggerEvent) => void
    onTrigger?: (event: DebuggerEvent) => void
    once?: boolean // default: false (3.4+)
  },
}

Also, make sure to set the WatchOptions defaults to the same as Vue. Currently, the default value for the deep option is true, but Vue uses false.