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

compiler/testData/asJava/lightClasses/SpecialAnnotationsOnAnnotationClass.java

@@ -0,0 +1,10 @@
+@kotlin.annotation.Retention(kotlin.annotation.AnnotationRetention.SOURCE)
+@kotlin.annotation.Target(allowedTargets = {kotlin.annotation.AnnotationTarget.TYPE_PARAMETER})
+@kotlin.annotation.MustBeDocumented
+@kotlin.annotation.Repeatable
+@java.lang.annotation.Documented
+@java.lang.annotation.Retention(java.lang.annotation.RetentionPolicy.SOURCE)
+@java.lang.annotation.Target({})
+public @interface Anno {
+    int i();
+}