Revert removal of sourcesJar task

Signed-off-by: Wei-Qiang Zhou <wei-qiang.zhou@alliander.com>

Author: wei-qiang

build.gradle

@@ -271,6 +271,16 @@ sourceSets {
     }
 }
 
+tasks.register('sourcesJar', Jar) {
+    dependsOn(tasks.named('generatePGMBindings'))
+    from sourceSets.main.java
+    archiveClassifier.set('sources')
+}
+
+artifacts {
+    archives sourcesJar
+}
+
 java {
     withSourcesJar()
     withJavadocJar()