Add `ISessionMigrationHandler` #2117

Job	Run time
build (windows-latest, Debug)	11m 14s
build (macos-latest, Release)	8m 32s
build (macos-latest, Debug)	8m 18s
build (ubuntu-latest, Debug)	7m 5s
build (ubuntu-latest, Release)	6m 58s
build (windows-latest, Release)	11m 38s
publish-coverage / publish-coverage	1m 0s
	54m 45s

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