add tests for comparison of package members

Original commit: bc6746b9e6

jps/jps-plugin/testData/comparison/packageMembers/packageFacadePublicChanges/old.kt

@@ -0,0 +1,13 @@
+package test
+
+public fun unchangedFun() {}
+
+public fun removedFun(): Int = 10
+
+public val removedVal: String = "A"
+
+public val changedVal: Int = 20
+
+internal fun changedFun(arg: Int) {}
+
+private fun privateRemovedFun() {}