HTTPX read timeout is set to infinite by default

[ryancausey]

I traced a hung client down to this following line where it appears if no timeouts are passed, the HTTP read timeout is set to None. This, as far as I can tell from the HTTPX docs, means it will never time out.

Line: https://github.com/fauna/fauna-python/blob/main/fauna/client/client.py#LL123C18-L123C18
HTTPX timeout docs: https://www.python-httpx.org/advanced/#timeout-configuration
FQLv10 code that produced the hung client: https://forums.fauna.com/t/fqlv10-comparison-of-objects-never-completes/3652

[ptpaterson]

Thanks for the issue, repro information, and bringing this to our attention!

More work is scheduled for the Python driver before GA. An internal issue has been created to track this: BT-3922