Java: Add upgrade and downgrade script

Author: IdrissRio

java/downgrades/1da2b6556cd039f88d2476ef4dd5453c21dcdd69/imports.ql

@@ -0,0 +1,12 @@
+class Import extends @import {
+  string toString() { none() }
+}
+
+class ClassOrInterface extends @classorinterface  {
+  string toString() { none() }
+}
+
+from Import imp, ClassOrInterface holder, string name, int kind
+where
+  imports(imp, holder, name, kind) and kind != 6
+select imp, holder, name, kind