Move: Warn about moving public declaration to non-public class

#KT-22771 Fixed

idea/testData/refactoring/move/kotlin/moveNestedClass/nonInnerToTopLevelPrivateClass/after/test/PrivateClass.kt

@@ -0,0 +1,7 @@
+package test
+
+private class PrivateClass {
+    class NestedClass {
+        val valInNestedC = 42
+    }
+}

idea/testData/refactoring/move/kotlin/moveNestedClass/nonInnerToTopLevelPrivateClass/after/test/test.kt

@@ -0,0 +1,8 @@
+package test
+
+class SomeClass {
+}
+
+fun main(args: Array<String>) {
+    val test = PrivateClass.NestedClass().valInNestedC
+}

idea/testData/refactoring/move/kotlin/moveNestedClass/nonInnerToTopLevelPrivateClass/before/test/PrivateClass.kt

@@ -0,0 +1,3 @@
+package test
+
+private class PrivateClass

idea/testData/refactoring/move/kotlin/moveNestedClass/nonInnerToTopLevelPrivateClass/before/test/test.kt

@@ -0,0 +1,11 @@
+package test
+
+class SomeClass {
+    class <caret>NestedClass {
+        val valInNestedC = 42
+    }
+}
+
+fun main(args: Array<String>) {
+    val test = SomeClass.NestedClass().valInNestedC
+}

idea/testData/refactoring/move/kotlin/moveNestedClass/nonInnerToTopLevelPrivateClass/conflicts.txt

@@ -0,0 +1 @@
+Variable test uses class NestedClass which will be inaccessible after move

idea/testData/refactoring/move/kotlin/moveNestedClass/nonInnerToTopLevelPrivateClass/nonInnerToTopLevelPrivateClass.test

@@ -0,0 +1,6 @@
+{
+  "mainFile": "test/test.kt",
+  "type": "MOVE_KOTLIN_NESTED_CLASS",
+  "targetClass": "test.PrivateClass",
+  "withRuntime": "true"
+}