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/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()