Add base actix-web integration

[singulared]

For integration with actix-web we need to implement trait Cacheable for HttpRequest and add some service\route declaration helper functions.
Something like this:

HttpServer::new(|| {
    App::new()
        .service(web::resource("/something")
            .route(web:get().to(get_something))
            .cache(ttl=60))
})