Build: Introduce new software component for publishing

Some of our published modules don't have javaComponent

libraries/reflect/build.gradle.kts

@@ -4,7 +4,6 @@ import com.github.jengelman.gradle.plugins.shadow.transformers.Transformer
 import com.github.jengelman.gradle.plugins.shadow.transformers.TransformerContext
 import kotlinx.metadata.jvm.KmModuleVisitor
 import kotlinx.metadata.jvm.KotlinModuleMetadata
-import org.gradle.api.tasks.PathSensitivity.RELATIVE
 import shadow.org.apache.tools.zip.ZipEntry
 import shadow.org.apache.tools.zip.ZipOutputStream
 
@@ -186,6 +185,10 @@ java {
     withSourcesJar()
 }
 
+configurePublishedComponent {
+    addVariantsFromConfiguration(configurations[JavaPlugin.SOURCES_ELEMENTS_CONFIGURATION_NAME]) { }
+}
+
 val sourcesJar = tasks.named<Jar>("sourcesJar") {
     archiveClassifier.set("sources")