Enable living documentation?

[rmannibucau]

Right now docfx has some nice code integration (apidoc, REST api, ...) but it is not generic and when you have a different need you have to implement a main (console project for ex) and run it before docfx.
My proposal is to enable docfx to generate virtual content (or better to be embedded programmatically) when rendering.
It can handle caching (thinking to watch command #10010) if nothing changed in dependencies for ex but this is not yet a requirement.

In the spirit it would be closed to "pre actions" of Yupiik tools utility (https://www.yupiik.io/tools-maven-plugin/mojos.html#preaction).