StoryIndex: Detect added/moved directories and batch invalidations

[tmeasday]

Issue:#16295

What I did

• Added some code to handle a directory added/moving as watchpack only gives us an event for the entire directory, not each file within it.

I use the files glob to scan the directory. This may be a mistake--perhaps I should just scan all files in the directory. What do you think? (this would be a rare event)

• Debounced the INVALIDATE event, so it fires at most twice, at least if watchpack events fire with no gap larger than 50ms.

How to test

1. Run react TS
2. Move the src/addon-docs directory [optionally add some more files in there too].
3. Check the stories haven't been lost in the UI
4. Check the INVALIDATE event only fired twice and stories.json was only fetched 4 times (2x2[manager+preview]).

• Is this testable with Jest or Chromatic screenshots?

Yes we have tests

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Status	Command
	nx run-many --target=prepare --all --parallel --max-parallel=15

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[shilman]

Nice. This is awesome, and great tests too!! 💪 💪 💪