Migrate radiks-server to typescript

[pradel]

• migrate the code to typescript (types are not the bests now but they will be improved bit by bit I guess)
• migrate eslint config to use typescript
• compile the project using babel
• add prettier for code formatting and run it on commit
• remove yargs from the dependencies (not used)
• remove fs-extra from the dependencies (not used)

Checks

• ✅ tests are passing
• ✅ eslint is passing
• ✅ project is compiling to a lib folder
• ✅ typecheck is run during the yarn build command