"Find Usages": add tests for Kotlin usages of Java declarations

idea/testData/findUsages/java/findJavaClassUsages/JKClassMethodsUsages.0.java

@@ -0,0 +1,14 @@
+// PSI_ELEMENT: com.intellij.psi.PsiClass
+// OPTIONS: methodUsages
+public class <caret>A {
+    public String bar = "bar";
+    public static String BAR = "BAR";
+
+    public void foo() {
+
+    }
+
+    public static void foos() {
+
+    }
+}