Add `export.Handler` #9187

Job	Run time
check-links	9s
lint (ubuntu-latest)	2m 55s
lint (ubuntu-22.04-arm)	4m 6s
compatibility-test (~1.24.0, ubuntu-latest, amd64)	1m 48s
race-test	2m 2s
compatibility-test (~1.23.1, ubuntu-latest, amd64)	50s
verify-licenses	40s
	12m 30s

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