Move antlr grammar over

Author: Varagos

server/package.json

@@ -8,8 +8,12 @@
     "node": "*"
   },
   "dependencies": {
+    "antlr4": "^4.11.0",
     "vscode-languageserver": "^7.0.0",
     "vscode-languageserver-textdocument": "^1.0.4"
   },
-  "scripts": {}
+  "scripts": {},
+  "devDependencies": {
+    "@types/antlr4": "^4.11.0"
+  }
 }