Vue3: Add default render function CSF3

[mrauhu]

Issue: #15498

Greetings.

What I did

In this pull-request I'm created a default render() function for Vue 3 and provided an example of usage with CSF3 story.

How to test

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

Testing

1. Build @storybook/vue3 package:

   yarn build vue3
   

2. Run Vue 3 CLI example:

   cd examples/vue-3-cli-example
   yarn storybook
   

3. Open ButtonCSF3 Storybook page in a browser.
   You will see a rendered Vue 3 component.

Best wishes,
Sergey.

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[shilman]

Thanks @mrauhu this is awesome!! ❤️