A bit related to #2285 but bigger scope

At #VueAmsterdam2023 the idea came up to make it possible to deprecate all the things like a whole component, named slots, emitters and so on via Volar so it will be displayed as strikethrough in VSCode (and maybe other IDEs)

So for example things like that:

<script setup lang="ts">
import MyDeprecatedComponent from '@/components/MyDeprecatedComponent.vue'
</script>

<template lang="pug">
MyDeprecatedComponent
//- ^ ~~~~~~~~~~~~~ ^

MyDeprecatedComponent
  template(#header="{ deprecatedItem, nonDeprecated }")
  //-       ^~~~~^    ^~~~~~~~~~~~~^
</template>

It might be that we need to add some new language features to vue/vue-macros to support this

e.g.

defineOptions({
  name: 'MyDeprecatedComponent',
  deprecated: 'Reason...',
})