Refactor sealed subclass to object: add tests, fix type parameter case

idea/testData/inspectionsLocal/convertSealedSubClassToObject/generic.kt

@@ -0,0 +1,5 @@
+// PROBLEM: none
+
+sealed class Sealed<T>
+
+<caret>class SubSealed<T> : Sealed<T>()

idea/testData/inspectionsLocal/convertSealedSubClassToObject/nonEmptyConstructor.kt

@@ -0,0 +1,5 @@
+// PROBLEM: none
+
+sealed class Sealed(val y: Int)
+
+<caret>class SubSealed(x: Int) : Sealed(x)

idea/testData/inspectionsLocal/convertSealedSubClassToObject/openSubclass.kt

@@ -0,0 +1,5 @@
+// PROBLEM: none
+
+sealed class Sealed
+
+open <caret>class SubSealed : Sealed()

idea/testData/inspectionsLocal/convertSealedSubClassToObject/withCompanion.kt

@@ -0,0 +1,9 @@
+// PROBLEM: none
+
+sealed class Sealed
+
+<caret>class SubSealed : Sealed() {
+    companion object {
+
+    }
+}

idea/testData/inspectionsLocal/convertSealedSubClassToObject/withInner.kt

@@ -0,0 +1,11 @@
+// PROBLEM: none
+
+sealed class Sealed
+
+<caret>class SubSealed : Sealed() {
+    val x: Int = 42
+
+    inner class Inner {
+        fun foo() = x
+    }
+}