Generator example

What?
Create an example using qtjenny that will generate cpp classes from Java.

Why?
To showcase how to use qtjenny and possible usecase/s.

When
To future QtTAS release

Tasks:

• See how the AS project is setup in https://git.qt.io/vivoutil/jennygeneratordemo/-/tree/maven/qtjenny?ref_type=heads
• Copy implementation from gitlab qtjenny to a new AS project
• Convert implementation in new project to Kotlin DSL