Add compliant event handler as extra, for use in other languages #898

Job	Run time
samples (Debug, ubuntu-24.04)	4m 4s
samples (Release, windows-2022)	9m 33s
samples (Debug, macos-latest)	1m 35s
samples (Release, macos-latest)	2m 13s
samples (Release, ubuntu-24.04)	5m 49s
samples (Debug, windows-2022)	2m 24s
	25m 38s

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