Feature/std.thread.builder

[Tejtex]

So I added start_with_builder which takes a std::thread::Builder, which allows to control the stack size and name of the thread.

Example:

use struct_threads::{Runnable, Thread};
   
struct MathTask(i32, i32);
 
impl Runnable for MathTask {
  type Output = i32;

  fn run(self) -> Self::Output {
    self.0 + self.1
  }
}

let task = MathTask(5, 7);
let builder = std::thread::Builder::new()
                                          .stack_size(32 * 1024);
let handle = task.start_with_builder(builder);

assert_eq!(handle.join().unwrap(), 12);