feat(VMenu): add submenu prop

[KaelWD]

Description

replaces #20091
closes #19093
closes #20130

TODO:

• Bug: open-on-hover closes multiple levels with keyboard

Markup:

<template>
  <v-list style="width: 200px">
    <v-list-item v-for="i in 5" :title="`Level 0 item ${i}`" link>
      <v-menu activator="parent" submenu>
        <v-list>
          <v-list-item v-for="j in 5" :title="`Level 1 item ${j}`" link>
            <v-menu activator="parent" submenu>
              <v-list>
                <v-list-item v-for="k in 5" @click="log">Level 2 item {{ k }}</v-list-item>
              </v-list>
            </v-menu>
          </v-list-item>
        </v-list>
      </v-menu>
    </v-list-item>
  </v-list>
</template>

<script setup>
  function log () {
    console.log('hello world')
  }
</script>

[github-actions]

🚀 Nightly release published to @vuetify/[email protected].

[github-actions]

🚀 Nightly release published to @vuetify/[email protected].

[github-actions]

🚀 Nightly release published to @vuetify/[email protected].