Add an option to pass your own requests class into the client

[kuhanaklobasa]

Is your feature request related to a problem? Please describe.
Yes, I wanted to customise timeouts but I didn't have a way so I wrote spaghetti code :=)

If your feature is related to implementing a new Roblox API, provide information here.
API URL: none
Documented: none

Describe the solution you'd like
Add an option to pass your own requests class into the client

Describe alternatives you've considered
None

Additional context

session = httpx.Session(timeout=10)
requests = Requests(
    url_generator=None,
    session=session
)
client = Client(requests=requests)

[jmkd3v]

going to do this for v3 along with aiohttp and pydantic