Emit timeout error if socket connection dies silently

[clue]

This project already supports detecting closed connections when receiving a close event. On top of this, to account for situations where the socket connection may die silently (e.g. due to power outage or network failure), we should also consider a connection dead if we don't receive any response to an outstanding query within a timeout period (default could be 600s?).

It's important to note that MySQL employs request/response semantics, and the server is expected to send query results in a timely manner. That being said, slow queries that are inefficient or process loads of data can take significantly longer.

Out of scope: MySQL also allows sending regular heartbeat/ping messages to keep the connection alive if there is no activity for a certain time, but we employ an idle connection time for this case anyway (see #147 / #88).

Refs clue/reactphp-redis#142, clue/reactphp-eventsource#37 and others

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