Make waitress timeout configurable

[corporategoth]

Right now, I have an issue where things can timeout after 10s for a combination of reasons, primarily

• Waitress timer is being set at the wrong time #856
• [Feature request]: Incorporate multi-threading zigbee2mqtt#20648

One quick thing that would help work around this is if I could adjust the waitress timeout. It would not fix the underlying issue, but allowing for a longer timeout might prevent things crashing under high load (ie. HA autoconfiguration, when the main loop is overloaded because Z2M generates a LOT of entities for my HA and Zigbee processing gets delayed, or a bunch of zigbee commands hits the concurrency limiter, since the timer is set pre-concurrency limit).

It would be nice if the waitress timeout could be adjusted in the configuration (similar to how the concurrency limit can be).

[github-actions]

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