Ability to bundle async web components by group

[spaceemotion]

What problem does this feature solve?

Currently, each web component is loaded via its own file. There is no way to give them names, so in one release .1.js could mean a date picker, and in the next it could be a modal component.

It would be helpful to have a way to group them by name like .forms.js.

If there is a way to register components in a JS file, without using the web component target directly, Using the webpackChunkName hint would work as well.

What does the proposed API look like?

The ability to chain a group parameter like so:

vue-cli-service build
  --target wc-async
  --inline-vue
  --name foo
  --group=input:src/components/input
  --group=layout:src/components/layout
   'src/components/**/*.vue'