[JExtract/JNI] Add tests for structs #718

Job	Run time
Test (Java) (macos swift:6.1.2 jdk:corretto)	2m 21s
Test (Java) (jammy swift:6.1.2 jdk:corretto)	2m 50s
Test (Swift) (macos swift:6.1.2 jdk:corretto)	3m 33s
Test (Swift) (jammy swift:6.1.2 jdk:corretto)	5m 45s
Benchmark (JMH) (jammy swift:6.1.2 jdk:corretto)	7m 30s
Sample JavaDependencySampleApp (macos swift:6.1.2 jdk:corretto)	5m 12s
Sample JavaKitSampleApp (macos swift:6.1.2 jdk:corretto)	1m 40s
Sample JavaProbablyPrime (macos swift:6.1.2 jdk:corretto)	4m 47s
Sample SwiftAndJavaJarSampleLib (macos swift:6.1.2 jdk:corretto)	4m 48s
Sample JavaSieve (macos swift:6.1.2 jdk:corretto)	3m 14s
Sample SwiftKitSampleApp (macos swift:6.1.2 jdk:corretto)	5m 26s
Sample JavaKitSampleApp (jammy swift:6.1.2 jdk:corretto)	4m 41s
Sample SwiftAndJavaJarSampleLib (jammy swift:6.1.2 jdk:corretto)	4m 37s
Sample JExtractJNISampleApp (macos swift:6.1.2 jdk:corretto)	5m 23s
Sample JavaProbablyPrime (jammy swift:6.1.2 jdk:corretto)	4m 37s
Sample JavaSieve (jammy swift:6.1.2 jdk:corretto)	2m 1s
Sample JavaDependencySampleApp (jammy swift:6.1.2 jdk:corretto)	7m 11s
Sample SwiftKitSampleApp (jammy swift:6.1.2 jdk:corretto)	5m 22s
Sample JExtractJNISampleApp (jammy swift:6.1.2 jdk:corretto)	5m 21s
soundness / License headers check	5s
soundness / Unacceptable language check	3s
soundness / Documentation check	34s
soundness / API breakage check	-1s
soundness / Broken symlinks check	3s
soundness / Python lint check	6s
soundness / YAML lint check	5s
soundness / Shell check	31s
soundness / Format check	-1s
	1h 27m 44s

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