Display available stories in storybook CLI (#3021)

This PR updates the storybook CLI to support displaying all of the
available stories.

The `--help` flag will now show a list of all the available stories:

<img width="1435" alt="Screenshot 2023-09-22 at 6 11 00 PM"
src="https://github.com/zed-industries/zed/assets/1486634/284e1a24-46ec-462e-9709-0f9b6e94931f">

Inputting an invalid story name will also show the list of available
stories:

<img width="1435" alt="Screenshot 2023-09-22 at 6 10 43 PM"
src="https://github.com/zed-industries/zed/assets/1486634/1ce3ae3f-ab03-4976-a06a-5a2b5f61eae3">

Release Notes:

- N/A