If webpack stats object gets large enough, JSON.stringify crashes

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### Bug report

The same bug that https://github.com/webpack/webpack-cli/pull/2190 fixes. The issue here is if webpack stats object is large enough you can no longer just call `JSON.stringify` on it, otherwise you get errors along the lines of `RangeError: Invalid string length`.

The fix here is to stream the JSON serialization rather than doing it at once. Fixing this might be tricky without making a breaking change to the plugin API since I'm not sure how it can be compatible with the current `opts.transform`