As a dev, I whould like that npm-assets and bower-asset are in the composer.json file

Problem/Motivation

By default it should be possible to add NPM and Bower libraries.
eg https://www.skillmaticace.com/blog/asset-packagist-makes-it-easy-add-ext...

Steps to reproduce

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Proposed resolution

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Remaining tasks

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User interface changes

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API changes

Data model changes