Make it easier to access the raw types from code generators

[jonaslagoni]

Reason/Context

If you create templates for the AsyncAPI generator, you often find yourself in the need of knowing the payload type of a message.

For example, if I want to generate something like:

publishToChannel(message MyMessage) {
  ...
}

I would need to template it like so:

publishToChannel(message <<INSERT MESSAGE TYPE>>) {
  ...
}

Currently, accessing the message type, if models are generated with Modelina, is not that straightforward, especially if we talk about primitive types.

I think #530 might solve it, as your model directly have access to something like model.type.

[github-actions]

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[jonaslagoni]

Solved in the next branch.