The Librarian CLI does not currently modify the order of library entries in state.yaml after they are added.

Consider re-sorting the entries and maintaining them in alphabetical order.

Benefits include:

1. "The CLI processes them in order so it would be nice to have them sorted."
2. Easier comparison with the repo directories and other alphabetized listings such as OwlBot/release-please configs.
3. Reduce merge conflicts when onboarding new libraries in parallel PRs.