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?

• [x] Bug fix
• [ ] New Feature
• [ ] Documentation update
• [ ] Other

Before submitting the PR, please make sure you do the following

• [x] Read the Contributing Guidelines.
• [ x Read the Pull Request Guidelines and follow the Commit Convention.
• [x] Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• [x] Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).