feat(VDatatable): to solve #11117

[berrywhj]

Description

Allow user to pass a param named sortDescendingFirst, so that the column can be sorted descending first, then ascending and (optionally) none.
resolves #11117

Markup:

packages/vuetify/dev/Playground.vue:

<template>
  <v-app>
    <h1>header rowspan/colspan</h1>
    <v-data-table
      :headers="complex"
      :items="items"
      :multi-sort="true"
      :sortDescendingFirst="true"
    >
    </v-data-table>

  </v-app>
</template>

<script setup>

  const items = Array(20).fill(0).map((_, i) => ({ id: i, name: `Name ${i}`, one: i, two: Math.random() > 0.5 ? 'foo' : 'bar', three: Math.random() > 0.5 ? 'hello' : 'world', four: i }))

</script>