[AA] allow to skip keywords completely

no need in fun/val/var in file structure

analysis/analysis-api/src/org/jetbrains/kotlin/analysis/api/renderer/base/KtKeywordRenderer.kt

@@ -27,5 +27,11 @@ public interface KtKeywordRenderer {
             printer.append(keyword.value)
         }
     }
+
+    public object NONE : KtKeywordRenderer {
+        context(KtAnalysisSession)
+        override fun renderKeyword(keyword: KtKeywordToken, owner: KtAnnotated, printer: PrettyPrinter) {
+        }
+    }
 }