Generate field for const-val with same visibility as desciptor

Also add test checking that constant static final fields generated for them

compiler/testData/compileJavaAgainstKotlin/property/ConstVal.txt

@@ -0,0 +1,26 @@
+package test
+
+public const val TOP_LEVEL: kotlin.String
+
+public object A {
+    private constructor A()
+    public const final val OBJECT: kotlin.String
+}
+
+@kotlin.annotation.annotation() public final class Ann : kotlin.Annotation {
+    public constructor Ann(/*0*/ kotlin.String)
+    public final val value: kotlin.String
+}
+
+public final class B {
+    public constructor B()
+
+    public companion object Companion {
+        private constructor Companion()
+        public const final val COMPANION: kotlin.String
+    }
+}
+
+@test.Ann(value = "OK56") public/*package*/ open class Java {
+    public/*package*/ constructor Java()
+}