refac: 유산 포인트 파트를 별도의 Manager로 분리, enum 적용

.phan/config.php

@@ -15,7 +15,7 @@ return [
     // Note that the **only** effect of choosing `'5.6'` is to infer
     // that functions removed in php 7.0 exist.
     // (See `backward_compatibility_checks` for additional options)
-    "target_php_version" => '8.0',
+    "target_php_version" => '8.1',
     'backward_compatibility_checks ' => true,
     'minimum_severity' => \Phan\Issue::SEVERITY_NORMAL,