feat: Add ModelIdentifier for all Java models (#612)

Author: tylerjroach

packages/appsync-modelgen-plugin/package.json

@@ -42,7 +42,7 @@
     "@graphql-codegen/testing": "^1.17.7",
     "@graphql-codegen/typescript": "^2.8.3",
     "graphql": "^15.5.0",
-    "java-ast": "^0.1.0",
+    "java-ast": "^0.3.0",
     "ts-json-schema-generator": "1.0.0"
   },
   "peerDependencies": {