KtLightElements: make light annotations lazier

Allow to get annotation list and to invoke `findAnnotation` without building delegate
Introduce KtLightNullabilityAnnotation which holds nullability information and is built
    before delegate is built

idea/src/org/jetbrains/kotlin/idea/KotlinLightConstantExpressionEvaluator.kt

@@ -21,7 +21,7 @@ import com.intellij.psi.PsiConstantEvaluationHelper
 import com.intellij.psi.PsiElement
 import com.intellij.psi.PsiExpression
 import com.intellij.psi.impl.ConstantExpressionEvaluator
-import org.jetbrains.kotlin.asJava.elements.KtLightAnnotation
+import org.jetbrains.kotlin.asJava.elements.KtLightAnnotationForSourceEntry
 import org.jetbrains.kotlin.idea.caches.resolve.getResolutionFacade
 import org.jetbrains.kotlin.idea.project.languageVersionSettings
 import org.jetbrains.kotlin.psi.KtExpression
@@ -49,7 +49,7 @@ class KotlinLightConstantExpressionEvaluator : ConstantExpressionEvaluator {
             throwExceptionOnOverflow: Boolean,
             auxEvaluator: PsiConstantEvaluationHelper.AuxEvaluator?
     ): Any? {
-        if (expression !is KtLightAnnotation.LightExpressionValue<*>) return null
+        if (expression !is KtLightAnnotationForSourceEntry.LightExpressionValue<*>) return null
         val expressionToCompute = expression.originalExpression ?: return null
         return when (expressionToCompute) {
             is KtExpression -> {

idea/src/org/jetbrains/kotlin/idea/refactoring/kotlinRefactoringUtil.kt

@@ -471,7 +471,7 @@ private fun copyModifierListItems(from: PsiModifierList, to: PsiModifierList, wi
         }
     }
     for (annotation in from.annotations) {
-        val annotationName = annotation.qualifiedName!!
+        val annotationName = annotation.qualifiedName ?: continue
 
         if (Retention::class.java.name != annotationName) {
             to.addAnnotation(annotationName)