Add compliant event handler as extra, for use in other languages #950

Job	Run time
samples (Release, ubuntu-24.04)	6m 29s
samples (Debug, macos-latest)	1m 56s
samples (Release, windows-2022)	10m 13s
samples (Debug, ubuntu-24.04)	5m 25s
samples (Debug, windows-2022)	2m 55s
samples (Release, macos-latest)	2m 32s
	29m 30s

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