Implement Worker Feature Detection

[runspired]

Workers should operate on a progressive-enhancement policy.

1. By default, messages are passed with stringified postMessage payloads.
2. If structured cloning is available, use it to transfer data.
3. If transferableObject is available, use it to transfer data.

Some Reading Material

• https://developers.google.com/web/updates/2011/12/Transferable-Objects-Lightning-Fast?hl=en
• https://developer.mozilla.org/en-US/docs/Web/API/Transferable
• https://developer.mozilla.org/en-US/docs/Web/Guide/API/DOM/The_structured_clone_algorithm