feat: add router integration

[KaelWD]

Resolves #1793

Depends on vuejs/router#1002

Markup:

<template>
  <v-app>
    <v-container>
      <v-btn to="/page1">button</v-btn>
      <router-link to="/page1">Page 1</router-link>
      <router-link to="/page2">Page 2</router-link>
    </v-container>
  </v-app>
</template>

Reference: https://github.com/vuejs/vue-router-next/blob/master/e2e/modal/index.ts