feat(VCombobox): port to v3

[johnleider]

Description

Ports v-combobox to v3 with a separate implementation from v-autocomplete. In the future, v-autocomplete will be updated to use this component as it's base.

Fixes #4679
Fixes #13091

Markup:

<template>
  <v-app>
    <v-main>
      <div class="ma-4 pa-4">
        <v-combobox
          v-model="combobox"
          label="Combobox 1"
          :items="items"
          autocomplete="new-password"
        />
        <v-combobox
          v-model="combobox"
          color="primary"
          label="Combobox 2"
          :items="items"
        />
        <v-combobox
          v-model="combobox"
          bg-color="primary"
          label="Combobox 3"
          :items="items"
        />

        <v-text-field
          v-model="combobox2"
          label="Text field"
          :items="items"
        />
        <v-select
          label="Select"
          :items="items"
        />
        <v-autocomplete
          v-model="combobox2"
          label="Autocomplete"
          :items="items"
        />
      </div>

      <br>
      <br>
      <br>
      <br>
      <br>
      <br>

      <pre>{{ { combobox, combobox2 } }}</pre>
    </v-main>
  </v-app>
</template>

<script setup>
  import { ref } from 'vue'

  const textfield = ref('')
  const combobox = ref('')
  // const combobox = ref(['foo', 'bar', 'fizz'])
  const combobox2 = ref('')
  const items = ['foo', 'bar', 'fizz', 'buzz', 'foobar']
</script>

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any features but makes things better)

Checklist:

• The PR title is no longer than 64 characters.
• The PR is submitted to the correct branch (master for bug fixes and documentation updates, dev for new features and backwards compatible changes and next for non-backwards compatible changes).
• My code follows the code style of this project.
• I've added relevant changes to the documentation (applies to new features and breaking changes in core library)