Reflection: add KAnnotatedElement.findAnnotation

#KT-12250 Fixed

compiler/testData/codegen/light-analysis/reflection/annotations/findAnnotation.txt

@@ -0,0 +1,19 @@
+public final class FindAnnotationKt {
+    public final static @org.jetbrains.annotations.NotNull method box(): java.lang.String
+}
+
+@Yes
+@No
+public final class Foo {
+    public method <init>(): void
+}
+
+@java.lang.annotation.Retention
+public annotation class No {
+    public abstract method value(): java.lang.String
+}
+
+@java.lang.annotation.Retention
+public annotation class Yes {
+    public abstract method value(): java.lang.String
+}