Rule Proposal: vue/no-undef-property

[golopot]

Please describe what the rule should do:

Forbid usages of undefined variable in vue template.

What category should the rule belong to?

[x] Warns about a potential error

Provide 2-3 code examples that this rule should warn about:

<template>
  <button @click="handleClick">foo</button>
  <!--            ~~~~~~~~~~~           -->
  <!--            'handleClick' is not defined.    -->
</template>

<script>
export default {}
</script>

[g-plane]

It's hard to detect, because Vue allows you to use mixins which can't be statically analyzed easily.