feat: handle path suffix in windows

[darkskygit]

fix #5

this pr fix the follow case:

const ASSETS: Embeds = embed! {
    base_path: "assets",
    files: ["static/*", "static/js/*", "static/**/*"],
};

pub async fn get_assets() -> Assets {
    let mut builder = Assets::builder();
    builder.add_embedded("test3/", &ASSETS["static/*"]);
    builder.add_embedded("test1/", &ASSETS["static/js/*"]);
    builder.add_embedded("test2/", &ASSETS["static/**/*"]);
    builder.build().await.expect("Failed to initialize assets")
}

• static/* will match folder
• in windows, static/js/ will be split to static/js/, but f.path will parse like this: static\js\something.js
• in windows and static/**/* glob, http_path will get hash key like this: static/js\something.js