Native websocket support in pwntools

In 2023 websockets are fairly popular in CTFs, but it seems there's currently no way to make pwntools socket library work with websockets.

* What the feature does
* Allow me to connect to a websocket server
* Allow me to send and receive messages
* Possibly similar to https://docs.pwntools.com/en/stable/tubes.html, but I'm not sure how well it maps, considering websockets are more like a channel for individual messages instead of an input/output stream
* Why the feature should exist
* Many CTFs use it in some way or another
* There's currently no good way to use pwntools with websockets
* What tests should be included
* 🤷

When searching for this feature I found these:

- https://gist.github.com/frankli0324/795162a14be988a01e0efa0531f7ac5a
- https://pypi.org/project/pwntools-tube-websocket/#description

Unfortunately I don't have the time/skills to implement this myself.

Start by reviewing the pwntools tubes documentation and the linked websocket tube implementation, then inspect closed pull request #2350 for prior design context. Define how message-oriented websocket connections should fit the existing tube API, including connection, send, receive, and test expectations; done means a documented, tested native websocket interface.

Written by the indexing model from the issue text.