Rewrite Gradle plugin connectTargets

[natario1]

Rewrite Gradle plugin's connectTargets implementation to use more modern approach:

   val buildType = ...
   val connectTargetsTask = ...
    androidComponents {
        onVariants(selector().withBuildType(buildType)) {
            it.sources.jniLibs!!.addGeneratedSourceDirectory(connectTargetsTask) { it.outputDir }
        }
    }

Also make it usable as an utility without the plugin being applied.