Support angular control flow (#15606)

Co-authored-by: dweizhe <d.weizhe@anyong.com.tw>
Co-authored-by: fisker <lionkay@gmail.com>

tests/unit/__snapshots__/visitor-keys.js.snap

@@ -1390,6 +1390,11 @@ exports[`visitor keys graphql 1`] = `
 exports[`visitor keys html 1`] = `
 {
   "attribute": [],
+  "block": [
+    "children",
+    "parameters",
+  ],
+  "blockParameter": [],
   "cdata": [],
   "comment": [],
   "docType": [],