feat: rename connectlib to substrafl
- [ ] The substra examples have been updated
- companion PRs have been opened on the following repositories:
- [ ] [connect-tests](https://github.com/owkin/substra)
- - [ ] [connectlib](https://github.com/owkin/connectlib)
+ - [ ] [substrafl](https://github.com/owkin/connectlib)
- [ ] [connect-documentation](https://github.com/owkin/connect-documentation)
See the the [documentation on contributions](https://github.com/owkin/tech-team/blob/main/CONTRIBUTING.md#contributing-to-owkins-software) for more information.
