Feature Request: Add support for CSS Modules localIdentName

[SimulatedGREG]

When using CSS modules in combination with @vue/test-utils, the DOM is created with class names equal to those that are defined within the <style/> block. For my company we use a custom localIdentName that is different from this default. It would be nice if the outputted class names could use a custom localIdentName.

This is useful for us specifically because we take an approach where each UI component we write should be wrapped with a .component class. So with a localIndentName of [name]-[local] each component would output something with a class name like .ui-button-component or .ui-input-component (where ui-button and ui-input are the filenames of our components).

Without the support for localIdentName in vue-jest, all of our wrapper classes are .component which, I'm sure you can imagine, can make it difficult when testing UI states where a specific DOM lookup is needed.

Hopefully this is enough to get my idea across, if not please feel free to ask any questions or perhaps I might be able to provide a thorough example. I am also aware since there isn't any use of webpack, nor more specifically css-loader, this may not be possible. But of course, please share any ideas for getting this to work!