Implement parsing annotations and modifiers starting with '@'

compiler/testData/psi/annotation/at/annotationValueArgumentsAmbiguity.kt

@@ -0,0 +1,7 @@
+fun foo() {
+    @ann ({ it -> it + 1}) // lambda parsed as argument of annotation, and annotated expression is "print(1)"
+    print(1)
+
+    @ann() ({ it -> it + 1}) // lambda in parenthesises annotated, "print(1)" is separated expression
+    print(1)
+}