Fetching dependencies declared in swift-java.config

[ktoso]

This will allow Swift users to fetch Java dependencies and "just use them".

It will become a pre-step to extract steps, such that we can "pull that dependency and expose the API I need from it" while we prepare the whole classpath for it etc.

// MyProject/Sources/JavaReactiveStreams/swift-java.config
{
  "dependencies": [
    "org.reactivestreams:reactive-streams:1.0.4"
  ],
  // FIXME: we should not need to express this classpath!
  "classPath": "JavaKit/build/classes/java/main",
}

So effectively we can expose existing Java libraries using such mini modules and such config file.

Example:

Java2Swift --fetch Samples/JavaDependencySampleApp/Sources/JavaKitExample/swift-java.config

[swift-java] Initialize JVM with classpath: JavaKit/build/classes/java/main
[debug][swift-java] Fetch dependencies: ["org.reactivestreams:reactive-streams:1.0.4"]
[trace][swift-java][JavaVirtualMachine] init complete JavaVirtualMachine(0x00000001049ef450)
[info][swift-java/DependencyResolver] Fetch dependencies: [org.reactivestreams:reactive-streams:1.0.4]
[info][swift-java/DependencyResolver] projectBaseDirectoryString =  /Users/ktoso/code/swift-java
[info][swift-java/DependencyResolver] Gradle API not available on classpath, bootstrap DependencyResolver dependencies: [dev.gradleplugins:gradle-api:8.10.1]
[info][swift-java/DependencyResolver] Bootstrap gradle-api for DependencyResolver: [dev.gradleplugins:gradle-api:8.10.1]
[info][swift-java/DependencyResolver] Bootstrap dependencies using project at: /var/folders/hn/c22y4jsn4j74mw23_kpgn88w0000gn/T/swift-java-dependency-resolver14393824301967899957
[info][swift-java/DependencyResolver] Prepared dependency resolver bootstrap classpath: 48 entries
[info][swift-java/DependencyResolver] Cache DependencyResolver dependencies classpath at: '/Users/ktoso/code/swift-java/.build/JavaKitDependencyResolver.classpath.swift-java'. Subsequent dependency resolutions will use gradle-api.
[info][swift-java] Resolved classpath for 1 dependencies of 'JavaKitExample': classpath entries: 3... done.
[debug][swift-java] Classpath entry: /private/var/folders/hn/c22y4jsn4j74mw23_kpgn88w0000gn/T/java-swift-dependencies6600421546298984751/build/classes/java/main
[debug][swift-java] Classpath entry: /private/var/folders/hn/c22y4jsn4j74mw23_kpgn88w0000gn/T/java-swift-dependencies6600421546298984751/build/resources/main
[debug][swift-java] Classpath entry: /Users/ktoso/.gradle/caches/modules-2/files-2.1/org.reactivestreams/reactive-streams/1.0.4/3864a1320d97d7b045f729a326e1e077661f31b7/reactive-streams-1.0.4.jar

[ktoso]

Squashed it all, will do followups to cleanup and add more things to this workflow.