Store all built-in languages

While we want the CodeQL Action to work with third-party language support, having a list of all built-in languages can help us create better type-level checks to ensure that we don't miss things that we want to customize for each of our built-in languages.

.github/workflows/script/tsconfig.json

@@ -0,0 +1,11 @@
+{
+  "extends": "../../../tsconfig.json",
+  "compilerOptions": {
+    "lib": ["esnext"],
+    "rootDir": "../../..",
+    "sourceMap": false,
+    "noEmit": true,
+  },
+  "include": ["./*.ts"],
+  "exclude": ["node_modules"]
+}