feature: add validator handler.

Author: ‘niuerzhuang’

dongtai-core/src/test/java/io/dongtai/iast/core/handler/hookpoint/models/policy/PolicyNodeTypeTest.java

@@ -14,7 +14,7 @@ public void testGet() {
             put(0, null);
             put(1, PolicyNodeType.PROPAGATOR);
             put(2, PolicyNodeType.SOURCE);
-            put(3, PolicyNodeType.FILTER);
+            put(3, PolicyNodeType.VALIDATOR);
             put(4, PolicyNodeType.SINK);
             put(5, null);
         }};