[Build] Make K/N backend sources publishing for IDE in a less hacky way

The previous way was too hacky relying on internal API
#KTI-1221 In Progress

kotlin-native/backend.native/build.gradle

@@ -249,3 +249,8 @@ publishing {
         }
     }
 }
+
+ArtifactsKt.sourcesJar(project) {
+    it.from(sourceSets["cli_bc"].allSource)
+    it.from(sourceSets["compiler"].allSource)
+}