Strip the token in GatewayBot, RESTBot and RESTApp

[FasterSpeeding]

Summary

Strip the token in GatewayBot, RESTBot and RESTApp to help avoid confusing errors which most bot devs won't understand (which are similar to the following) whenever they accidentally leave a trailing newline at the end of their header (I don't like having to explain this to ppl lol)

Traceback (most recent call last):
  File "C:\Users\Lucina\PycharmProjects\hikari\test.py", line 9, in <module>
    asyncio.run(run())
  File "C:\Users\Lucina\.pyenv\pyenv-win\versions\3.10.0\lib\asyncio\runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "C:\Users\Lucina\.pyenv\pyenv-win\versions\3.10.0\lib\asyncio\base_events.py", line 641, in run_until_complete
    return future.result()
  File "C:\Users\Lucina\PycharmProjects\hikari\test.py", line 7, in run
    await session.get("https://google.com", headers={"ok":"no\n\r"})
  File "C:\Users\Lucina\PycharmProjects\hikari\venv\lib\site-packages\aiohttp\client.py", line 557, in _request
    resp = await req.send(conn)
  File "C:\Users\Lucina\PycharmProjects\hikari\venv\lib\site-packages\aiohttp\client_reqrep.py", line 669, in send
    await writer.write_headers(status_line, self.headers)
  File "C:\Users\Lucina\PycharmProjects\hikari\venv\lib\site-packages\aiohttp\http_writer.py", line 130, in write_headers
    buf = _serialize_headers(status_line, headers)
  File "aiohttp\_http_writer.pyx", line 132, in aiohttp._http_writer._serialize_headers
  File "aiohttp\_http_writer.pyx", line 116, in aiohttp._http_writer._safe_header
ValueError: Newline or carriage return character detected in HTTP status message or header. This is a potential security issue.

But yeah for ppl who are used to being abstracted away from http semantics this won't be understandable

Checklist

• I have run nox and all the pipelines have passed.
• I have made unittests according to the code I have added/modified/deleted.

Related issues

[davfsa]

Althought I dont really like us having to do this for the user, I do understand it, so ig it is something we canhave