Support for nested module graphs

[npars]

⚠️ Is your feature request related to a problem? Please describe

When you have some nested and some non-nested modules the graph becomes messy when showFullPath = false. Ideally a subgraph would be nested within any existing parent graphs.

💡 Describe the solution you'd like

Support for nesting modules in the graph. Possibly via a config boolean, or enabled by default.

Here is what currently is produced:

%%{
  init: {
    'theme': 'neutral'
  }
}%%

graph LR
  subgraph :libs
    :libs:app-common["app-common"]
  end
  subgraph :libs:crash-reporting
    :libs:crash-reporting:api["api"]
    :libs:crash-reporting:firebase["firebase"]
  end
  :App --> :libs:app-common
  :App --> :libs:crash-reporting:api
  :App --> :libs:crash-reporting:firebase
classDef focus fill:#769566,stroke:#fff,stroke-width:2px,color:#fff;
class :App focus

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Here is what I would like if nesting modules is enabled:

%%{
  init: {
    'theme': 'neutral'
  }
}%%

graph LR
  subgraph :libs
    :libs:app-common["app-common"]
    subgraph :crash-reporting
      :libs:crash-reporting:api["api"]
      :libs:crash-reporting:firebase["firebase"]
    end
  end
  :App --> :libs:app-common
  :App --> :libs:crash-reporting:api
  :App --> :libs:crash-reporting:firebase
classDef focus fill:#769566,stroke:#fff,stroke-width:2px,color:#fff;
class :App focus

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🤚 Do you want to develop this feature yourself?

• Yes
• No
• Maybe if I find some time 😄