Add initial version of hash history

[mohe2015]

Fixes #348

Usage: Provide Rc::new(HashHistory::default()) as root context

[jkelleyrtp]

Thanks for the PR! Very much appreciated.

I added a playwright test and then cleaned up the history module which had become a little cluttered after its long evolution.

I also added a configuration entry so you can customize the history with the Config object.

    dioxus::LaunchBuilder::new()
        .with_cfg(dioxus::web::Config::new().history(Rc::new(HashHistory::new(false))))
        .launch(|| {
            rsx! {
                Router::<Route> {}
            }
        })