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/compilationErrors/RepetableAnnotations.kt

@@ -0,0 +1,30 @@
+// p.Annotations
+package p
+
+
+class Annotations {
+
+    @R("a") @R("b") @R("c")
+    fun repeatables1() {
+
+    }
+
+    @R("a")
+    fun repeatables2() {
+
+    }
+
+    @R("a") @S("b") @R("c") @S("D") @R("f")
+    fun repeatables3() {
+
+    }
+
+}
+
+@Repeatable
+@Retention(AnnotationRetention.SOURCE)
+annotation class S(val g: String)
+
+@Repeatable
+@Retention(AnnotationRetention.SOURCE)
+annotation class R(val s: String)