jextract: add support for implementing Swift protocols in Java #1106

Job	Run time
Benchmark (JMH) (jammy swift:6.2 jdk:corretto)	8m 55s
Benchmark (Swift) (jammy swift:6.2 jdk:corretto)	4m 10s
Documentation check (6.2, jammy, corretto)	4m 36s
Test (Java) (macos swift:6.2 jdk:corretto)	2m 22s
Test (Java) (jammy swift:nightly jdk:corretto)	2m 58s
Test (Java) (jammy swift:6.2 jdk:corretto)	2m 45s
Sample SwiftJavaExtractJNISampleApp (macos swift:6.2 jdk:corretto)	1m 52s
Test (Swift) (macos swift:6.2 jdk:corretto)	3m 23s
Test (Swift) (jammy swift:nightly jdk:corretto)	5m 55s
Test (Swift) (jammy swift:6.2 jdk:corretto)	4m 42s
Test (Swift) (jammy swift:6.1.3 jdk:corretto)	5m 6s
Sample SwiftJavaExtractJNISampleApp (jammy swift:6.1.3 jdk:corretto)	50s
Sample SwiftJavaExtractJNISampleApp (jammy swift:nightly jdk:corretto)	53s
Sample SwiftJavaExtractJNISampleApp (jammy swift:6.2 jdk:corretto)	50s
soundness / Unacceptable language check	9s
soundness / License headers check	10s
soundness / Broken symlinks check	6s
soundness / YAML lint check	8s
soundness / Python lint check	9s
soundness / Documentation check	-1s
soundness / Shell check	17s
soundness / API breakage check	-1s
soundness / Format check	0s
	50m 14s

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