Add an encodable version of the APIGatewayResponse #65

Job	Run time
Semantic Version label check	4s
Unit tests / Construct unit test matrix	4s
Soundness / License headers check	4s
Soundness / API breakage check	1m 9s
Soundness / Documentation check	38s
Soundness / Unacceptable language check	3s
Soundness / Broken symlinks check	3s
Soundness / Format check	30s
Soundness / Python lint check	8s
Soundness / Shell check	30s
Soundness / YAML lint check	4s
Swift 6 Language Mode / Swift 6 language mode	54s
Unit tests / Unit tests / Linux (6.0)	1m 0s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 10s
Unit tests / Unit tests / Linux (nightly-main)	1m 10s
	7m 31s

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