[Websocket] Support All Opcodes

[abuneri]

This PR is just handling the basic/simple essentials for receiving and sending all the opcodes.

Things that are out of scope for this PR:

• Logging
• Any Reconnect/Resume logic
• Handling the dispatch Events

This PR satisfies Identify logic in #6 , and almost all (95%-ish) of heartbeat logic. (the last TODO for heartbeats requires connection state and is outside the scope of initial release anyways)

[abuneri]

👍