Right now if you are working with multiple projects, all of them have a pretty large node_modules folder, partially due to the size of the ios and android runtimes, and a lot of storage is wasted and it adds up quickly.

Proposal: make @nativescript/ios and @nativescript/android lightweight "placeholders" that indicate to the CLI (or a postinstall script / script invoked by the CLI) where/how to fetch the runtime files and reuse them if they have already been downloaded to a global cache directory.

• make npm packages lightweight
• cache runtime files (per version) in a global cache folder
• perform checksums to avoid corrupted downloads/caches
• reuse cached runtime if present
• keep a "last-used" metadata file in cache directory and auto-cleanup when a specific version has not been used for X amount of time (prevents excessive cache buildup over time)
• allow cleaning the cache easily - perhaps ns clean --full or something similar

The actual runtime files would need to be hosted perhaps as GitHub release assets, this definitely complicates the publish pipeline, however we are (I believe) getting close to the npm package size limit, so sooner or later we might need to do this anyways.

/cc @edusperoni @triniwiz @NathanWalker