feat: allow mermaid visualization in domains

[stanipetrosyan]

Motivation

Resolve issue #376 for create mermaid graph in domains.
Also I refactored graph.ts file introducing Mermaid builder class.

Hope everything is right, let me know if there are issues with my changes.

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[stanipetrosyan]

Ok, I think is ready. I created new mermaid builder class just for domain case (if we want improve mermaid chart creation in future), leaving the same old logic for events and service. I improved graph test because previously they can failure for different spacing. Let me know if there are issues with my changes.

[boyney123]

Thank you for the pull request.

V2 is coming out very soon, and things have changed under the hood. And now you can add mermaid code blocks to any resource.

I'm going to close this for now. Ping if you want to keep open and push for a merge....