Add sheet component

[zhiyanzhaijie]

⚠️ [WIP] (some changes need to consult)
feature:
Add new component sheet (#158)

content:

1. component(doc, preview_demo, playwright_test)
2. component registry
3. Readme updated

dangerous update might need revalidate:

1. update DialogCtx for public used
2. add mew module - utils for dynamic component. Inspired by:
   - hngngn/shadcn-solid,
   - corvudev/corvu
   , who implement a dynamic infra to make an asChild-like feature. (I don't know whethere it's a good choice or not)

[github-actions]

Preview available at https://dioxuslabs.github.io/components/pr-preview/pr-162/

[ealmloff]

I think this is roughly as good as we can make this interface with dioxus today. Eventually I would like something like this to be possible with props which would make it easier to extend an arbitrary component instead of just attributes: https://docs.rs/frunk/latest/frunk/labelled/trait.Transmogrifier.html

I think solidjs requires dynamic because of its rendering model. Since dioxus does diffing, you should just be able to call the as closure directly

[zhiyanzhaijie]

What I updated:

1. Directly use r#as callback to render component instead of utils/dynamic
2. update and shrink the style.css
3. add Doc comments for pub DialogCtx

[ealmloff]

Thanks, this is fantastic! I'm glad to see this only required very minimal changes to dioxus-primitive itself