Add tests for publicField

compiler/testData/codegen/boxWithJava/publicField/simple/Test.java

@@ -0,0 +1,6 @@
+public class Test {
+    public static String invokeMethodWithPublicField() {
+        C c = new C();
+        return c.foo;
+    }
+}

compiler/testData/codegen/boxWithJava/publicField/simple/simple.kt

@@ -0,0 +1,7 @@
+class C {
+    @publicField private val foo: String = "OK"
+}
+
+fun box(): String {
+    return Test.invokeMethodWithPublicField()
+}