Add start/stop to core integration MQTT

testing the instance for system overload, I tried to stop the MQTT integration, since this is a suspect for a lot of processor usage. Only to find out we can only delete the integration, and have to restart the full instance to have a system without MQTT.

This is not only cumbersome, but it also requires the system to completely calm down again after initial startup, and makes it rather unclear when the MQTT overload would be of influence.

A simple start/stop on the integration could solve this?

have that appear under ‘Configure’

of possible, it would be great to have this in general of course.

had a Frontend FR but that was closed cold because it should be made available first in the backend (and current workflow is to close an do nothing…)
So, here’s a formal backend FR to request once more.