Emit timeout error if socket connection dies silently

[clue]

This project already supports reconnecting with a retry timer when the connection closes (#7/#26). Additionally, we should consider a connection to be dead if we did not receive any data for a timeout period (default could be 600s?). The server is expected to send regular heartbeat/ping messages (such as the empty comment :\n) to keep the connection alive if there is no activity (each 15-60s seems reasonable). This is particularly useful in the event where the socket connection may die silently such as due to power outages or network failure.

Refs clue/reactphp-redis#132, https://github.com/reactphp/http#timeouts, https://launchdarkly.github.io/dotnet-eventsource/api/LaunchDarkly.EventSource.ReadTimeoutException.html

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