Feature: Let Parents Modify & Typely Strict Their Children (with `Element<T>` or similar)

Sup boys!

This has been on my mind for a while but totally slipped my TODO list, classic. So while working on some Open Sass components like [`radio-rs`](https://github.com/opensass/radio-rs), I noticed there's no easy way for parent to programmatically modify their children and restrict their types.

Yew has this handy dandy [`ChildrenWithProps`](https://docs.rs/yew/latest/yew/html/type.ChildrenWithProps.html) type that lets you strictly type children *and* poke at their props, which is kinda powerful (and makes Yew feel a bit like it has superpowers over Dioxus in this specific area 😅).

It'd be amazing if you could get a `Element` or something similar in Dioxus that lets us:

- Strictly type children.
- Programmatically modify them from a parent component.

Right now, the only workaround I come up with is to [manually construct the Element](https://github.com/opensass/radio-rs/blob/afad83c6eddea4ffa6728125078ae557a76e6127/src/dioxus.rs#L62)… but then I couldn't get the browser to rerender it properly. I think it needs a portal or something similar, know what i mean?

So yeah, feature request: Kindly provide us with an easy way to strictly type and modify children elements!

Thanks!