Implement `Pack` #3204

Job	Run time
prerequisites	4m 49s
Lint pkg	27s
go-tests	4m 30s
test_templates	5m 5s
test_integrations (stack-reference)	1m 13s
test_integrations (stack-transformation)	1m 0s
examples (aws-java-eks-minimal)	2m 22s
test_integrations (adopt-into-component)	1m 13s
examples (aws-java-webserver)	1m 55s
test_integrations (rename)	1m 20s
examples (aws-native-java-s3-folder)	2m 11s
test_integrations (rename-component)	1m 14s
examples (azure-java-appservice-sql)	1m 51s
test_integrations (rename-component-and-child)	1m 34s
examples (azure-java-static-website)	1m 48s
test_integrations (retype-component)	1m 17s
examples (gcp-java-gke-hello-world)	2m 21s
test_integrations (retype-parents)	1m 41s
examples (kubernetes)	1m 34s
examples (minimal)	2m 1s
examples (minimalsbt)	1m 53s
examples (random)	1m 37s
	44m 56s

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