Include source files to allow debugging

[angelo-v]

I wanted to debug using breakpoints, but I noticed that the source files are not included in the npm package. But the source maps are included, so you probably want to do something about that. I copy&pasted the sources manually and it seems to work, but it’s still not working perfectly. Maybe that has something to do with the minification; I’m not sure how you could improve it (to be honest, I don’t think my libraries are perfectly debuggable either 😅). But at least including the TypeScript sources should be a better experience :).

https://forum.solidproject.org/t/request-for-developer-feedback-contacts-data-module/7372/9