feat(VDataTable): highlight filter matches

[KaelWD]

Description

Closes #20357 Depends on #16462

Markup:

<template>
  <v-container>
    <v-data-table :headers="headers" :items="items" :search="search" item-value="name" />

    <v-combobox v-model:search="search" :items="items" item-title="name" />
  </v-container>
</template>

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

  const search = ref('')
  const headers = [
    {
      title: 'Dessert (100g serving)',
      align: 'start',
      sortable: false,
      key: 'name',
    },
    { title: 'Calories', align: 'end', key: 'calories' },
    { title: 'Fat (g)', align: 'end', key: 'fat' },
    { title: 'Carbs (g)', align: 'end', key: 'carbs' },
    { title: 'Protein (g)', align: 'end', key: 'protein' },
    { title: 'Iron (%)', align: 'end', key: 'iron' },
  ]
  const items = [
    {
      name: 'Frozen Yogurt',
      calories: 159,
      fat: 6.0,
      carbs: 24,
      protein: 4.0,
      iron: '1',
    },
    {
      name: 'Jelly bean',
      calories: 375,
      fat: 0.0,
      carbs: 94,
      protein: 0.0,
      iron: '0',
    },
    {
      name: 'KitKat',
      calories: 518,
      fat: 26.0,
      carbs: 65,
      protein: 7,
      iron: '6',
    },
    {
      name: 'Eclair',
      calories: 262,
      fat: 16.0,
      carbs: 23,
      protein: 6.0,
      iron: '7',
    },
    {
      name: 'Gingerbread',
      calories: 356,
      fat: 16.0,
      carbs: 49,
      protein: 3.9,
      iron: '16',
    },
    {
      name: 'Ice cream sandwich',
      calories: 237,
      fat: 9.0,
      carbs: 37,
      protein: 4.3,
      iron: '1',
    },
    {
      name: 'Lollipop',
      calories: 392,
      fat: 0.2,
      carbs: 98,
      protein: 0,
      iron: '2',
    },
    {
      name: 'Cupcake',
      calories: 305,
      fat: 3.7,
      carbs: 67,
      protein: 4.3,
      iron: '8',
    },
    {
      name: 'Honeycomb',
      calories: 408,
      fat: 3.2,
      carbs: 87,
      protein: 6.5,
      iron: '45',
    },
    {
      name: 'Donut',
      calories: 452,
      fat: 25.0,
      carbs: 51,
      protein: 4.9,
      iron: '22',
    },
  ]
</script>

[KaelWD]

Matches are keyed on item.value so it does funny things if item-value is not set correctly like highlight the second character of every item.

https://github.com/vuetifyjs/vuetify/blob/7dbfe6b37b3aceb53bac6ca25ab74074df2bd94f/packages/vuetify/src/composables/filter.tsx#L200