Add migration lifecycle hooks #2521

Job	Run time
Test user experience (18.x, ubuntu-latest)	30s
CI (20.x, postgres)	1m 5s
Test user experience (18.x, macos-latest)	1m 18s
CI (20.x, pgnative)	1m 11s
Test user experience (18.x, windows-latest)	4m 44s
CI (20.x, mysql)	1m 7s
CI (20.x, mssql)	1m 24s
CI (20.x, sqlite3)	40s
CI (20.x, cockroachdb)	2m 3s
CI (20.x, better-sqlite3)	40s
CI (20.x, oracledb)	6m 3s
CI (18.x, postgres)	1m 2s
CI (18.x, pgnative)	1m 6s
CI (18.x, mysql)	1m 11s
CI (18.x, mssql)	1m 15s
CI (18.x, sqlite3)	47s
CI (18.x, cockroachdb)	2m 1s
CI (18.x, better-sqlite3)	42s
CI (18.x, oracledb)	5m 14s
CI (16.x, postgres)	2m 3s
CI (16.x, pgnative)	2m 11s
CI (16.x, mysql)	2m 3s
CI (16.x, mssql)	2m 10s
CI (16.x, sqlite3)	1m 32s
CI (16.x, cockroachdb)	2m 53s
CI (16.x, better-sqlite3)	1m 35s
CI (16.x, oracledb)	6m 10s
	54m 40s

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