Allow mapping of data to a ViewModel

Introduce configuration to allow mapping from the datasource to a ViewModel, and mapping from the ViewModel to the datasource

Using [Automapper](https://automapper.org/) may be the preferred technique here

No files, tests, or entry points are named. Start by tracing how the library generates Minimal API endpoints for an Entity Framework context, then determine where mapping configuration belongs; done means data can be mapped in both directions between the datasource and a ViewModel.

Scritto dal modello di indicizzazione a partire dal testo della issue.