Support for dynamic components

[sharkykh]

Fixes #1
Only literal values are supported (no <component :is="computedProp" />).
Maybe add a note about this rule's false positives, because that's the reason it's on a separate plugin.
In this case - need to use a disable comment on the reported line, e.g.
<!-- eslint-disable-next-line @sharkykh/vue-extra/component-not-registered -->

<template>
  <!-- ✗ Component "debug" is used but not registered -->
  <debug />
</template>
<script>
const debugComponent = process.env.NODE_ENV === 'production' ? undefined : () => import('./Debug.vue');

export default {
  components: {
    ...debugComponent
  }
};
</script>