feat(no-multiple-template-root): support disallowComments property

[chouchouji]

Issue

resolve #2316

Todo

• complete docs

[chouchouji]

@FloEdelmann I am confused about how to determine if it is the comment of the root node. So I choose to filter invalid comments by node ranges. If you have better idea, please tell me. Thanks!

<template>
  <!-- this is a comment --> // should report
   <div>
       123
       <!-- this is a comment --> // should not report
   </div>
   <!-- this is a comment --> // should report
</template>