Add call_js macro

[mcmah309]

Adds a call_js! macro to simplifies calling a javascript function with arguments and returning a value.

e.g.

let value = call_js!("assets/example.js", greeting(from, to)).await.unwrap();

It also validates the js in assets/example.js is valid, the function e.g. greeting exists, is exported, and the number of arguments in the call are correct at compile time.

Edit:
Alternative syntax's to consider

let value = call_js!("assets/example.js"::greeting(from, to)).await.unwrap();

let value = call_js!(
    #[source("assets/example.js")]
    greeting(from, to)
).await.unwrap();

[mcmah309]

I also thought of this, it might be might be nice to create compile time function(s). Since we are already doing introspection, we know the number of arguments needed and this is possible:

use_js!("assets/example.js"::greeting)
// or use_js!("assets/example.js::*")

fn main() {
    let value = greeting(from, to).await.unwrap();
}

[mcmah309]

I ended up working on the use_js! macro and created a PR for it in the dioxus repo DioxusLabs/dioxus#4309

If merged, this can then be closed