Use workspaces or npm pack for jest link

[lastmjs]

Jest link is finicky and sometimes results in difficult TypeScript errors when importing one package through symlinks into another. We tried a lot of things with Mom pack and preinstall, but in the end using preinstall cannot work in this way.

The most promising path forward is to use workspaces to potentially allow all examples to install or use each other without hopefully symlink issues.

See this PR for our work trying to get this to work for bitcoin_psbt: #2464