Generates an AsyncIterable which can be awaited on for one or more signals. dispose() can be called when you are finished waiting on the events.

Example:

      import { signal } from "./mod.ts";

      const sig = signal("SIGUSR1", "SIGINT");
      setTimeout(() => {}, 5000); // Prevents exiting immediately

      for await (const _ of sig) {
        console.log("interrupt or usr1 signal received");
      }

      // At some other point in your code when finished listening:
      sig.dispose();