Method spawn

packages/core/src/threading/Thread.ts:160–168

(
    child: ThreadGenerator | (() => ThreadGenerator),
  )

  }

  public spawn(
    child: ThreadGenerator | (() => ThreadGenerator),
  ): ThreadGenerator {
    if (!isThreadGenerator(child)) {
      child = child();
    }
    this.queue.push(child);
    return child;
  }

  public add(child: Thread) {
    child.parent = this;