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

idea/testData/findUsages/java/findJavaFieldUsages/JKFieldUsages.0.java

@@ -0,0 +1,5 @@
+// PSI_ELEMENT: com.intellij.psi.PsiField
+// OPTIONS: readAccess
+public class A {
+    public String <caret>foo = "foo";
+}

idea/testData/findUsages/java/findJavaFieldUsages/JKFieldUsages.1.kt

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+fun test() {
+    val a = A()
+    a.foo = "bar"
+    println(a.foo)
+}

idea/testData/findUsages/java/findJavaFieldUsages/JKFieldUsages.results.txt

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+Value read (4: 15) println(a.foo)
+Value write (3: 7) a.foo = "bar"