Write JSON stats file in streaming fashion and omit chunks for brevity

[ghengeveld]

Issue: -

What I did

Some people have reported out-of-memory errors when using --webpack-stats-json on their very large Storybook. This was tracked to JSON.stringify using too much memory. This PR addresses that by using json-ext's stringifyStream and piping the result into the target file.

I've also omitted chunks from the data, because it accounts for about half of the total blob size and isn't particularly useful to have. Technically that's a breaking change but it's very unlikely anybody is actually using that field.

How to test

• Is this testable with Jest or Chromatic screenshots? no
• Does this need a new example in the kitchen sink apps? no
• Does this need an update to the documentation? no

If your answer is yes to any of these, please make sure to include it in your PR.

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[tmeasday]

LGTM apart from maybe @shilman's thing.

[anilanar]

This works!