Add sample projects for complex topics #1126
Description
Description
In #1125 I proposed to add sample projects for core concepts of the framework. Through this issue, I'd like to expand the collection of sample projects to also include topics like HSL, introspection, SPI, injection scopes, etc.
Use case
Having samples for complex topics allows us to show more of Hartshorn's features, and introduce users to how complex issues can be resolved through the Hartshorn framework.