refactor: move business logic into separate file
This MR moves business logic in a separate file.
That way, the index begins with the start
making easier to follow.
index.js -> start()
- /core -> business logic from "grdf tech"
- /requests -> requests from each grdf, bo, cozy
index.js
but I didn't moved them to keep git history and because the new konnector changes the consent section, not getting the data