Implement planning-package contract v2. #597

Job	Run time
test (ubuntu-latest)	2m 48s
repository-contract	35s
race-critical	1m 2s
flow-sdk	38s
test-windows (0)	2m 7s
test-windows (4)	1m 45s
test-windows (2)	1m 26s
test-windows (1)	1m 7s
test (macos-latest)	4m 35s
test-windows (5)	2m 1s
test-windows (3)	1m 49s
component-control-program-compiler	11s
component-extension-conformance	15s
component-plant-integration	33s
component-standard-flow	16s
component-surface-parity	1m 1s
component-kernel-mechanism	14s
	22m 23s

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