Add `WebSocketStream` API

[btwiuse]

WebSocketStream API explaination:

• https://web.dev/i18n/en/websocketstream/
• https://github.com/ricea/websocketstream-explainer/blob/master/README.md

Implementations:

• https://chromestatus.com/feature/5189728691290112
• https://doc.deno.land/deno/unstable/~/WebSocketStream

[BlobTheKat]

support