Project restructure

[Freymaurer]

• Move testsuit to vitest, react-testing-library and jsdom
  • remove need for webpack, copy pasting fable output to different folders,
• Add build project for test management/release (planned)
• Use bun as dependency manager.
  • Allows manual adding of dependencies for each project.
  • Can run all test projects with a single command from root.
• Seperate test projects into areas of concern. Move into tests/ 🚚
• Move all feliz projects into src/ 🚚
• Add Feliz.Vitest.React project with minimal bindings for vitest
• Update some Fable.ReactTestingLibrary bindings to return the correct Promise output, after moving the bindings into their own fsproject 🚚
• remove paket package manager 🔥
• remove travis/appveyor in favor of github actions
• added central package management to handle nuget dependencies instead of paket

The goal of this PR was to reduce the overall repo complexity. Due to the nature of this there are a lot of files moved which leads to almost all files being changed.

Closes #661

[MangelMaxime]

@Freymaurer I left some comments, I mark the PR as red mainly to ensure we have discussion about the different topics.