[2.0.0-beta4] Add a stories specific discovery

Checked with Florent, no need for this anymore

After a night of sleep I remember why I put this comment.

In a project using a UI Suite theme and having a sub theme, you will use patterns with styles in Layout Builder or anywhere else.

The idea was to enrich the patterns preview in libraries with the styles applied on the project.

Not enough time left in Beta1.

Related to [#15739436]

Work has started

We will need 📌 Make DirectoryWithMetadataDiscovery generic and reusable Active to make the implementation nice

Mostly done.

Next steps:

• check why stories from theme are loaded as plugins, but not loaded by ::getComponentStories()
• #story in render element: use machineName instead of plugin ID
• tests?

Moved back to beta4.

Next steps:

• update component converter (drush upm)

Already tested with alert component, it's working !

Now I will apply this to all other components to finish my test process.

RTBC +1 :)

Finally updated all DaisyUI components. Worked like a charm !

Just wondering: is it possible to manage ordered stories when we have more than one ?

I need to update ui_patterns_devel too