Add SendableMetatype conformance #607

Job	Run time
Semantic Version label check	4s
Unit tests / Construct unit test matrix	4s
musl	1m 39s
Integration Tests / No dependencies on Foundation	1m 41s
Integration Tests / Test archive plugin (ResourcesPackaging)	2m 34s
Integration Tests / Test archive plugin (HelloWorld)	2m 27s
Soundness / API breakage check	2m 29s
Soundness / Documentation check	1m 38s
Soundness / Unacceptable language check	3s
Integration Tests / Test Examples/APIGateway on	2m 3s
Integration Tests / Test Examples/S3_AWSSDK on	6m 37s
Integration Tests / Test Examples/ResourcesPackaging on	2m 20s
Integration Tests / Test Examples/S3_Soto on	7m 53s
Integration Tests / Test Examples/S3EventNotifier on	2m 25s
Integration Tests / Test Examples/Streaming on	2m 15s
Integration Tests / Test Examples/HelloWorld on	2m 22s
Integration Tests / Test Examples/BackgroundTasks on	2m 17s
Integration Tests / Test Examples/APIGateway+LambdaAuthorizer on	2m 18s
Integration Tests / Test Examples/Testing on	2m 25s
Integration Tests / Test Examples/Tutorial on	2m 27s
Integration Tests / Test Examples/HelloJSON on	1m 47s
Soundness / Python lint check	5s
Soundness / YAML lint check	5s
Soundness / License headers check	4s
Soundness / Broken symlinks check	4s
Soundness / Format check	36s
Soundness / Shell check	31s
Swift 6 Language Mode / Swift 6 language mode	1m 22s
Unit tests / Unit tests / Linux (6.1)	1m 22s
Unit tests / Unit tests / Linux (6.0)	1m 26s
Unit tests / Unit tests / Linux (nightly-next)	1m 52s
Unit tests / Unit tests / Linux (nightly-main)	1m 52s
	59m 7s

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