✨ [Feature]: Please support unplugin-vue-components

[transtone]

What problem does this feature solve

不积极加入vue开发相关生态，谁知道有个什么 opentiny，还要自己写按需加载的解析器，对开发者太不友好了。

What does the proposed API look like

添加 unplugin-vue-components 组件

[kagol]

很好的建议，自动按需导入组件还是很实用的，可以支持

[lanrenbulan]

现在支持了吗

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Is it supported now?

[mengqiuleo]

我来实现这个新特性🚀

[Issues-translate-bot]

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Let me implement this new feature🚀

[kagol]

Finished by @mengqiuleo on #1397, released in v3.14.0