This PR contains the work that implements the Persistence service, which is used to store and serve the data of the application.
To give further details on what was done:
- [x] created the `Persistence`library into the **Libraries** package;
- [x] defined the `Location` model into the **Model** core data model;
- [x] implemented the `PersistenceService` service;
- [x] removed the core data stack boilerplate code from the `AppDelegate` and `SceneDelegate` delegates in the *Locations* target.
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Reviewed-on: rock-n-code/deep-linking-assignment#5
