Allow accepting/passing arbitrary sets of attributes to components

[circuitsacul]

Say I have a component; for example, a wrapper around an <a> tag that adds commonly used HTMX attributes. I would like to also allow the caller to define the ID & classes, and other attributes on the tag, without having to list all possible attributes in the component definition.

#[component]
fn htmx_link<'a, R: Renderable>(url: &'a str, children: &R) -> impl Renderable {
    maud! {
        a
            /* how do I accept the id/classes here... */
            href=(url)
            hx-get=(url)
            hx-push-url=true
            hx-swap="none"
            hx-target={"#" (target)}
        { (children) }
    }
}

// elsewhere....
maud! {
    HtmxLink #i-still-want .to-customize[this == "stuff"] url="my/link" { "clicky" }
}

It would also be nice if I could use the native maud syntax for the IDs, classes, optional/conditional attributes, etc. (as I've done above), but having any way to pass in a list of "extra" attributes that are arbitrarily applied to the underlying tag would be wonderful.

[XX]

This issue is probably related to
#180
#128