refactor: Add types

[Semro]

• [ ] extension scripts:
  • [x] background
  • [x] content
  • [x] options
  • [x] popup
  • [ ] players
  • [ ] loadNetflix
  • [ ] netflix
• [x] server
• [x] revisit test's scripts:
  • [x] fixtures
  • [x] main.spec.ts
• [x] create a package to share types between server and client
• [x] update server ci
• [ ] type chrome.runtime.sendMessage like socket.io events