Warn/report token soon to expire?

A command (gh aw audit) or general workflow logging could warn when PAT tokens are soon to expire?

```
curl -I -H "Authorization: Bearer <YOUR_PAT>" https://api.github.com/user
```

gives response header

```
GitHub-Authentication-Token-Expiration: 2021-10-07 19:07:53 UTC
```

@pelikhan WDYT?
