Non-primitive props should not be added to attributes with Stencil plugin

[Graphmaxer]

Checklist

• Did you run the analyzer with the --dev flag to get more information?
• Did you create a minimal reproduction in the playground?

Non-primitive prop types (object, dates, etc...) should NOT be added to the attributes list in custom element manifest.

In this example we can see that object/date props are added as attributes:

https://custom-elements-manifest.netlify.app/?source=CmltcG9ydCB7IENvbXBvbmVudCwgUHJvcCB9IGZyb20gJ0BzdGVuY2lsL2NvcmUnOwoKQENvbXBvbmVudCh7CiAgdGFnOiAnbXktZWxlbWVudCcsCn0pCmV4cG9ydCBjbGFzcyBNeUVsZW1lbnQgewogIEBQcm9wKCkgY29sb3I6IHN0cmluZzsKCiAgQFByb3AoKSBvYmplY3RXaXRoS2V5d29yZDogb2JqZWN0OwoKICBAUHJvcCgpIG9iamVjdFdpdGhUeXBlOiB7IGZvbzogc3RyaW5nIH07CgogIEBQcm9wKCkgZGF0ZTogRGF0ZTsKfQo%3D&library=stencil

This is strange because this behavior is documented here with a comment https://github.com/open-wc/custom-elements-manifest/blob/master/packages/analyzer/src/features/framework-plugins/stencil/stencil.js#L57 but this is not implemented like this. In the past this behavior was right 1d4c7b1#diff-4052a5b77a3c558016f33f9b0ff894ea7c3337023d3132e32de0536c6a1ca753L69 but I got replaced for some reasons :/

In my case, this causes an issues with https://github.com/wc-toolkit/storybook-helpers because object prop cannot be an attribute, preventing the correct control type in Storybook (https://github.com/wc-toolkit/storybook-helpers/blob/main/src/cem-parser.ts#L385).

Expected behavior

Non-primitive props should be added to attributes list, only in members

[Graphmaxer]

Not the same problem but we should also hide the render method in the members list.

Example here:

https://custom-elements-manifest.netlify.app/?source=CmltcG9ydCB7IENvbXBvbmVudCwgUHJvcCB9IGZyb20gJ0BzdGVuY2lsL2NvcmUnOwoKQENvbXBvbmVudCh7CiAgdGFnOiAnbXktZWxlbWVudCcsCn0pCmV4cG9ydCBjbGFzcyBNeUVsZW1lbnQgewogIEBQcm9wKCkgY29sb3I6IHN0cmluZzsKCiAgcmVuZGVyKCkgewogICAgLy8gUmV0dXJucyBKU1ggaHR0cHM6Ly9zdGVuY2lsanMuY29tL2RvY3MvZ2V0dGluZy1zdGFydGVkI215LWZpcnN0LWNvbXBvbmVudAogIH0KfQo%3D&library=stencil

There is already a method denylist https://github.com/open-wc/custom-elements-manifest/blob/master/packages/analyzer/src/features/framework-plugins/stencil/stencil.js#L6

[fgeierst]

We run into the same two issues this week, also using Stencil and @wc-toolkit/storybook-helpers. Besides that, the integration with Stencil works great!