Support intelliSence for class style vue and vue-property-decorator

[John0King]

• I have searched through existing issues
• I have read through docs
• I have read FAQ

Info

• Platform: Win
• Vetur version: 0.24.0
• VS Code version: 1.44.2

Problem

doesn't support class style vue with vue-property-decorator for tag/property IntelliSence

Reproducible Case

<template>
  <div class="hello">
    <h1 @click="onGo()">{{ msg }}</h1>
  </div>
</template>

<script lang="ts">
import { Component, Prop, Vue, Emit } from 'vue-property-decorator';

@Component
export default class HelloWorld extends Vue {
  @Prop() 
  msg!: string;

  @Emit("go")
  onGo(){
    return "go";
  }
}
</script>

[yoyo930021]

Wait for #1323.

[octref]

Duplicate of #1105.