feat(VInfiniteScroll): add reset method

[giftimie]

Description

When the VInfiniteScroll reaches the 'empty' state, it is not possible to get out of it without doing any tricks such as caching the done method.
Many users are using this component to paginate search results, and when a specific search returns zero items, the component will be stuck in the empty state

closes #20308
closes #19935

Markup:

<template>
  <v-app>
    <v-container>
      <v-infinite-scroll ref="infiniteScrollRef" height="300" side="end" @load="load">
        <template v-for="(item, index) in items" :key="index">
          <div :class="['px-2', index % 2 === 0 ? 'bg-grey-lighten-2' : '']">
            Item number {{ item }}
          </div>
        </template>
      </v-infinite-scroll>
      <v-btn @click="reset">Call reset</v-btn>
    </v-container>
  </v-app>
</template>

<script setup>
  import { ref } from 'vue'
  const infiniteScrollRef = ref(null)

  const items = ref([])

  function reset() {
    items.value = []
    infiniteScrollRef.value.reset()
  }

  function load({ side, done }) {
    setTimeout(() => {
      if (items.value.length >= 40) {
        done('empty')
        return
      }

      const arr = Array.from({ length: 10 }, (k, v) => (items.value.at(-1) ?? 0) + 1 + v)
      items.value = [...items.value, ...arr]

      done('ok')
    }, 1000)
  }
</script>

[laa-1]

I also encountered this problem when I tried to combine VInfiniteScroll and paging

[erikvdplas]

@J-Sek Any chance this PR will get merged? Solution seems to work well and the method seems to be highly-requested by the community. I currently encounter this issue as well. If I can do anything to expedite the process, let me know.

[J-Sek]

I wish I could see at least one example where it would fail when implementation omits these rAF wrappers. Or maybe you could tell me if these were copied from done "just in case" or for some actual reason.

[giftimie]

On my end it also worked fine with and without, I just copied them from above because of #17475

[J-Sek]

Nevermind, linting fails for spec files.