Add `export.Handler` #9234

Job	Run time
race-test	2m 5s
check-links	8s
compatibility-test (~1.24.0, ubuntu-latest, amd64)	1m 52s
lint (ubuntu-latest)	2m 54s
compatibility-test (~1.23.1, ubuntu-latest, amd64)	57s
lint (ubuntu-22.04-arm)	3m 2s
verify-licenses	49s
	11m 47s

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