feat: Create a postAction script to run via node after template installs

[BenjaminMichaelis]

Dotnet template prompts user if they want to run.

[ascott18]

While this is an interesting concept to explore, I'm not sure if its exactly the experience that we want. I think I'm preferential to having the setup commands be provided by the documentation so it is clear to the user what's going to happen, and to expose new users to these commands they'll be running frequently as part of their project rather than hiding them away in a "magic" script.

[BenjaminMichaelis]

It was a fun exploration nonetheless :)