Add GitHub Action for Class Reference

[CakeVR]

Is your feature request related to a problem?
If users want to learn about the source code, they will be sent to navigate Dialogic on this repository or their local addon copy.
They will be exposed to a lot of information they must not know and must understand how to navigate the source code.

Describe the solution you'd like
Generating the class reference automatically whenever a commit lands on the main branch.

Additional context:
Example class reference: https://docs.godotengine.org/en/4.0/classes/index.html
How to generate it via CLI: https://docs.godotengine.org/en/stable/tutorials/editor/command_line_tutorial.html

[CakeVR]

The class reference has been added with the PR #46.

The update process is not automatic yet and the tool has not been published yet. I need to evaluate when and how we want to automate the generation of documentation.