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

idea/testData/findUsages/java/findJavaMethodUsages/JKMethodUsages.1.kt

@@ -0,0 +1,7 @@
+fun test() {
+    A().foo()
+    B().foo()
+
+    val a = A::foo
+    val b = B::foo
+}