build: wire up ng-dev ts-node config loading (angular#46437)

With the new ESM version of `ng-dev`, the TypeScript config loading
cannot happen automatically because `ts-node` cannot hook into the
Node ESM module resolution at runtime. To fix this `ng-dev` is now
loading a plain `.ng-dev/config.mjs` and the runtime just needs to be
configured accordingly, i.e. running `ng-dev` with `ts-node` so that
the ESM loader can be wired up before Node's runtime starts (using e.g.
`node --loader`).

PR Close angular#46437

.ng-dev/config.mts

@@ -0,0 +1,15 @@
+import {caretaker} from './caretaker.mjs';
+import {commitMessage} from './commit-message.mjs';
+import {format} from './format.mjs';
+import {github} from './github.mjs';
+import {pullRequest} from './pull-request.mjs';
+import {release} from './release.mjs';
+
+export {
+  commitMessage,
+  format,
+  github,
+  pullRequest,
+  caretaker,
+  release,
+};

.ng-dev/tsconfig.json

@@ -1,10 +1,10 @@
 {
   "compilerOptions": {
     "strict": true,
-    "target": "es2015",
-    "module": "commonjs",
+    "target": "es2020",
+    "module": "Node16",
     "noEmit": true,
     "skipLibCheck": true,
     "types": []
-  },
+  }
 }

package.json

@@ -24,6 +24,7 @@
     "/ ": "",
     "postinstall": "node scripts/webdriver-manager-update.js && node --preserve-symlinks --preserve-symlinks-main ./tools/postinstall-patches.js",
     "prepare": "husky install",
+    "ng-dev": "ts-node --esm --project .ng-dev/tsconfig.json node_modules/@angular/dev-infra-private/ng-dev/bundles/cli.mjs",
     "test": "bazelisk test",
     "test:ci": "bazelisk test -- //... -//devtools/... -//aio/...",
     "test-tsec": "bazelisk test //... --build_tag_filters=tsec --test_tag_filters=tsec",