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.java

@@ -0,0 +1,18 @@
+public final class Annotations {
+    @p.R(s = "a")
+    @p.R(s = "b")
+    @p.R(s = "c")
+    public final void repeatables1() { /* compiled code */ }
+
+    @p.R(s = "a")
+    public final void repeatables2() { /* compiled code */ }
+
+    @p.R(s = "a")
+    @p.S(g = "b")
+    @p.R(s = "c")
+    @p.S(g = "D")
+    @p.R(s = "f")
+    public final void repeatables3() { /* compiled code */ }
+
+    public Annotations() { /* compiled code */ }
+}