refactor(@angular-devkit/build-angular): use Node.js promise fs API in service-worker augmentation #20518
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With the minimum version of Node.js now set to v12, the promise fs API can now be leveraged within the tooling.
This change also uses
copyFile
(with copy-on-write where available) to setup the the service worker files as well a streaming APIs to generate service worker hashes. Both of which improves performance and reduces memory usage.