Custom buttons in stream view UI

[redford-jones]

Describe what you are trying to accomplish and why in non technical terms
My cameras support 'privacy mode' which is physically obscures the lens via a switch. This is controllable via an API. It would be useful to be able to control this (or any other camera related function) via a custom, configurable button in the UI.

Describe the solution you'd like
Add the option to create a custom button, which publishes a message to a Frigate MQTT topic. This could then be used in Home Assistant to control an automation.

Describe alternatives you've considered
I currently have an automation which toggles the enable/disable recording option for each of these cameras, this then toggles the privacy mode of the cameras. This becomes out of sync if Frigate is restarted.

Additional context
Possibly by adding a customisable button here:

[github-actions]

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