.NET 6 upgrade plus minimal apis

[antoniovalentini]

Hey 👋
would you be interested in an upgrade for Linker to .NET6 and a migration to minimal apis? I may open a PR if you want.

I've appreciated your Cake presentation at the NDC Conferences, and I thought I could contribute to Linker.

[ecampidoglio]

Hi there! I'm glad you enjoyed the presentation.

Sure, feel free to open a PR. 👍

[antoniovalentini]

#21 is here :)
Let me know what you think. Thanks!