[FE] Add sealed classes related properties to java model

core/compiler.common.jvm/src/org/jetbrains/kotlin/load/java/structure/javaElements.kt

@@ -86,6 +86,8 @@ interface JavaClass : JavaClassifier, JavaTypeParameterListOwner, JavaModifierLi
     val isAnnotationType: Boolean
     val isEnum: Boolean
     val isRecord: Boolean
+    val isSealed: Boolean
+    val permittedTypes: Collection<JavaClassifierType>
     val lightClassOriginKind: LightClassOriginKind?
 
     val methods: Collection<JavaMethod>

core/descriptors.runtime/src/org/jetbrains/kotlin/descriptors/runtime/structure/ReflectJavaClass.kt

@@ -122,6 +122,12 @@ class ReflectJavaClass(
     override val isRecord: Boolean
         get() = false
 
+    override val isSealed: Boolean
+        get() = false
+
+    override val permittedTypes: Collection<JavaClassifierType>
+        get() = emptyList()
+
     override fun equals(other: Any?) = other is ReflectJavaClass && klass == other.klass
 
     override fun hashCode() = klass.hashCode()