remove nx

[kukeiko]

What

Remove NX in favor of tsc + vitest

• [x] ability to debug tests
• [x] generate code coverage
• [x] one command to build packages for distribution
• [x] remove reflect-metadata
• [x] includable in other projects using tsconfig paths pointing to dist folder w/ source map support
• [x] publish & install test in another project

Why

I initially picked NX as I was planning to also have angular sample projects within the same repository. However NX brings more pain then gain currently. A very simple setup is more than enough.

Framework specific sample apps will have to go into separate git repos

[kukeiko]

note for future me: i used .mts for index files, but am changing that in another commit (where I am cleaning up the tools stuff) to be .ts, as it seems that auto import prioritizes that lower - which is what I want (I don't want to ever import from index.ts within core package for example). with index.mts, auto import puts the index at the top position making it a bit cumbersome to auto import