feat: add FontAwesomeIconProps export in index.d.ts

[lctech-jeff]

This will fix the export issue like mentioned before.

FaIcon.vue

<template>
  <FontAwesomeIcon :icon="props.icon" />
</template>

<script setup lang="ts">
import { type FontAwesomeIconProps, FontAwesomeIcon } from '@fortawesome/vue-fontawesome'

// will get error with @vue/compiler-sfc
const props = defineProps<InstanceType<typeof FontAwesomeIcon>['$props']>()

// missing FontAwesomeIconProps in export
// const props = defineProps<FontAwesomeIconProps>()
</script>

<style lang="scss" scoped></style>

if I use InstanceType<typeof FontAwesomeIcon>['$props'], then error occur like this picture.

We except to use the code like this `const props = defineProps()`.

[lctech-LeoLioa]

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