fix(vue3): ensure 3rd party components directly imported in script setup do not show up as Anonymous Component in devtools

[LinusBorg]

Description

When we import and use a 3rd Party component in <script setup> like in the following example, it will show up as <Anonymous Component> in devtools.

<script setup>
import Child from 'cool-ui-library'
</script>
<template>
   <Child />
</template

This PR makes devtools fall back on the internal __name property added by @vitejs/plugin-vue (this name is derrived from the filename) if no explicit name has been set.

Additional context

I'm not sure how to add a test case for this. But I hope the fix is trivial enough to do without one.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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