fetchone / __iter__ timeout

could be possible implement a timeout with techone/ __iter__ function? sometimes it's usefull, i have a big binlog (1G+) and since i'm ignoring some tables/events, it hit a lot the continue keyword, and i have more than 10seconds "stalled", maybe a "heartbeat like" but at client side could help, something like raising a "pythonclientheartbeat"

Start by reading the fetchone and __iter__ entry points, focusing on how ignored tables or events lead to repeated continue behavior while processing a large binlog. The issue does not name a file, test, timeout semantics, or acceptance criteria; clarify the client-side heartbeat or timeout behavior before implementation, then add coverage showing the intended stalled-processing outcome.

Written by the indexing model from the issue text.