Add an init() that match the APIGatewayResponse #84

Job	Run time
Unit tests / Construct unit test matrix	5s
Semantic Version label check	8s
Soundness / Documentation check	42s
Soundness / API breakage check	1m 19s
Soundness / Broken symlinks check	6s
Soundness / Unacceptable language check	6s
Soundness / License headers check	12s
Soundness / Format check	38s
Soundness / Shell check	36s
Soundness / YAML lint check	5s
Swift 6 Language Mode / Swift 6 language mode	54s
Soundness / Python lint check	8s
Unit tests / Unit tests / Linux (6.0)	1m 7s
Unit tests / Unit tests / Linux (nightly-next)	1m 30s
Unit tests / Unit tests / Linux (6.1)	1m 13s
Unit tests / Unit tests / Linux (nightly-main)	1m 31s
	10m 20s

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