Custom Threads handler

[knassar702]

we can create custom functions/class to handle threads to avoid writing duplicating code
for example instead of using stream::iter every time with custom scope, we can use something like create_thread()

async fn create_thread(input: Vec<String> , target_func: fn(url), callback: fn(out)) {
       // a few threading lines
}

[knassar702]

working on