Vue3: Introduce portable stories API

[yannbf]

Relates to storybookjs/testing-vue3#14

What I did

This PR introduces the mechanism which is currently available in https://github.com/storybookjs/testing-vue3 but now as part of the @storybook/vue3 package instead.

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=<PR_NUMBER>

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[shilman]

Looks great -- fantastic work @yannbf !!! 💪

[chakAs3]

i was waiting for this @yannbf finally Good Job you did not even need my help

[chakAs3]

However it is time to fix the render function in Vue render to match the official test api, there is a bit of issue here
I find that the testing-library/vue is more legit that the render function in @storybook/vue3
Also i suggest to rename @storybook/vue3 , @storybook/vue, to match with vue current naming convention. and rename @storybook/vue to @storybook/vue2.7 . we need to be consistent with other api so users won't be confused

NB:Dropping Vue 2.7 is recommended

[chakAs3]

However it is time to fix the render function in Vue render to match the official test api, there is a bit of issue here
I find that the testing-library/vue is more legit that the render function in @storybook/vue3
Also i suggest to rename @storybook/vue3 , @storybook/vue, to match with vue current naming convention. and rename @storybook/vue to @storybook/vue2.7 . we need to be consistent with other api so users won't be confused

NB:Dropping Vue 2.7 is recommended