feat(@angular/build): Support splitting browser and server stats json files for easier consumption by tsteuwer-accesso · Pull Request #33209 · angular/angular-cli

…files for easier consumption

This feature supports splitting out the browser and server stats json files so it's easier to inspect the bundle in various analyzers and addresses angular#28185 angular#28671. Today, everything gets dumped into a single file and it's nearly impossible to use without hours of `fix -> remove unused browser/server chunks -> analyze` and starting the loop all over again.

This feature implements the feature request I made in angular#28185, along with another developers request to see a stats json file for just the initial page bundle. I've tested this out in my own repository and it's already helped an incredible amount. This will be required to be in the next Major version as it will break any existing build pipeline that relies on a single stats.json file.