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

plugins/annotation-processing/src/org/jetbrains/kotlin/annotation/processing/RoundAnnotations.kt

@@ -18,7 +18,6 @@ package org.jetbrains.kotlin.annotation.processing
 
 import com.intellij.psi.*
 import com.intellij.psi.util.PsiTreeUtil
-import org.jetbrains.kotlin.asJava.elements.KtLightAnnotation
 import org.jetbrains.kotlin.asJava.findFacadeClass
 import org.jetbrains.kotlin.asJava.toLightClass
 import org.jetbrains.kotlin.codegen.state.KotlinTypeMapper

plugins/annotation-processing/testData/wrappers/kotlinWrappers/kotlinAnnotations.txt

@@ -6,6 +6,7 @@ public final class Test {
     @org.jetbrains.annotations.NotNull
     public final java.lang.String getF()
 
+    @org.jetbrains.annotations.NotNull
     @org.jetbrains.annotations.NotNull
     public final void a()