Start showing a bouncing icon in the Dock

Start showing an animated icon in the Dock from the time `launch` is about to start the application onwards.

The Dock is then responsible for stopping the animated icon and show the regular application icon in case the app has launched, or just remove the animated icon altogether after a timeout, or in case the application exits.

Is there already a protocol/standard for this?

The issue names no files or tests. Start by examining how launch reports application startup and exits, then determine whether an existing Dock protocol or standard supports the requested animation lifecycle. Done means the Dock can begin the animated icon before launch, replace or remove it after success, timeout, or application exit.

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