🛠 Tooling: Generate .github files and other package/repository metadata in setup

[JoshuaKGoldberg]

Tooling Report Checklist

• I have tried restarting my IDE and the issue persists.
• I have pulled the latest main branch of the repository.
• I have searched for related issues and found none that matched my issue.

Expected

I'd like shenanigans-manager to be able to completely bootstrap a ready-to-go repository. There are some missing files, such as .github/* and .vscode/*.

Additional Info

https://github.com/JoshuaKGoldberg/ChooseYourFramework is a model example.