feat: Inline context for custom and migration events #73

Job	Run time
test-packaging	3m 21s
test-contract-tests	2m 32s
test-platforms-and-versions (ubuntu-latest, 8)	2m 38s
test-platforms-and-versions (ubuntu-latest, 11)	2m 35s
test-platforms-and-versions (ubuntu-latest, 17)	2m 28s
test-platforms-and-versions (ubuntu-latest, 19)	2m 32s
	16m 6s

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