Generate Atoms of different types

[AdamRamberg]

Is your feature request related to a problem? Please describe.
Make it possible to generate Atoms of different type for:

• Actions
• Listeners
• Functions
• Events

Eg. generate a BoolIntEvent. This should be done in the Generator already available in Unity Atoms.

Describe the solution you'd like
This is not part of the regular Atoms generation currently implemented in Unity Atoms. I propose to create a new "page" in the Generator to generate "Multi Atoms" (I'm open for better naming here). The user will first pick what Atom to generate (selection box): Action, Listener, Function or Event. Then options to add types will appear.

Describe alternatives you've considered
Another consideration is to create a new Generator for this kind of generation.

I would be really appreciate someone making a PR on this. Make sure to read the guidelines before starting + assign yourself (or ask me) to the issue. Also don't hesitate to ask any further questions below before developing.