Feat: eager loading of assets

[omar-mohamed-khallaf]

The first commit implements a solution to #4644.
The others are lints applied by clippy.

[ealmloff]

An option to inject stylesheets and scripts at compile time into the head would be great, but I don't think it should be the default. manganis is built to work across libraries and this doesn't seem like a good default for libraries. Adding dioxus-components should not inject the stylesheet into the head for components I don't use automatically

Can you invert the default here and switch to a method like with_static_head?

The diff here is also very large and touches a lot of unrelated files. I'm guessing you have a different clippy config than we use. Can you revert those changes?

[omar-mohamed-khallaf]

Yeah, I have a different config showing 200 warnings for request.rs alone, so I nuked the whole crate with cargo clippy --fix -- -Wclippy::all -Dclippy::correctness -Wclippy::pedantic.