* Write BUILD_ID when building.
It's a random id (uuid.v4())
* Add buildId to the core JS files.
* Add immutable cache-control header.
Only if the buildId is matched.
* Set '-' as the dev buildId always.
* Add buildId handling for JSON pages.
* Server JSON pages directly from the filesystem.
* Make Json pages even if there's an error.
* Implement much better page serving.
* Use JsonPagesPlugin in the production mode as well.
* Add gzip support for JSON pages.
* Use glob-promise instead of recursive-readdir
* Handle renderStatic 404 properly.
* Simply the gzip code.
* Cache already read JSON pages.
* Change JSON pages extension to .json.
* Fix HMR related issue.
* Fix hot-reload for .json solely on server.
* Properly clear cache on hot-reloader.
* Convert .js pages into .json page right inside the plugin.
* Fix gzipping .json pages.
* Remove unwanted json pages cleanup.
* Get rid of deprecated fs.exists for fs.access
* Add AOT gzip content-encoding support.
Currently we only do this for
main.js and commons.js only.
* Remove unwanted await.
* Use Promise.all to gzip assets in parallel.
