Add support for source generators

[Emik03]

Feature Description

It would be incredible to have this working with source generators, both the native ones such as injecting System.Text.RegularExpressions.GeneratedRegexAttribute, as well as third-party ones like my Emik.ChoiceAttribute. You might even want to consider supporting analyzers too, since some third-party analyzers offer very good errors. Such an example would be another tool of mine (yes another shameless plug). I understand that this is a very hard feature to implement, so I don't expect it to be doable, but I would greatly appreciate it if it could be added.