[jextract] add support for throwing functions in JNI mode #575

Job	Run time
Verify Sample JavaProbablyPrime (swift:6.0.2 jdk:Corretto os:jammy)	4m 21s
Swift tests (swift:6.0.2 jdk:Corretto os:jammy)	5m 3s
Verify Sample JavaSieve (swift:6.0.2 jdk:Corretto os:jammy)	1m 0s
Verify Sample SwiftKitSampleApp (swift:6.0.2 jdk:Corretto os:jammy)	6m 37s
Java tests (swift:6.0.2 jdk:Corretto os:jammy)	10m 21s
Verify Sample JavaKitSampleApp (swift:6.0.2 jdk:Corretto os:jammy)	4m 25s
Verify Sample SwiftAndJavaJarSampleLib (swift:6.0.2 jdk:Corretto os:jammy)	6m 15s
Verify Sample JavaDependencySampleApp (swift:6.0.2 jdk:Corretto os:jammy)	4m 50s
soundness / Broken symlinks check	5s
soundness / License headers check	6s
soundness / Shell check	33s
soundness / Format check	0s
soundness / YAML lint check	6s
soundness / API breakage check	0s
soundness / Documentation check	35s
soundness / Unacceptable language check	4s
soundness / Python lint check	6s
	44m 27s

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