Consider adding syntax for arbitrary code injection

[bruno-f-cruz]

As a follow up for #40, it would be interesting to consider a way to inject arbitrary literal code when classes are generated. Many questions should be addressed if this is to be allowed but for now just leaving this here as a reminder.

[bruno-f-cruz]

After playing a bit with this idea I came to the conclusion that realization that the 'partial' strategy seems to be a better way to maintain the use cases I was trying to solve. Closing as not planned!