feat(dependency graph): add option to create a dependency graph

[jamieshorten]

Closes #118

Adds an option to create a dependency graph. (Does not include references from supertypes to extending types).

Changes

The ConcertoGraphVisitor now optionally supports a parameter, createDependencyGraph, that if truthy stops the visitor from creating edges from supertypes to extending types.

Author Checklist

• Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• [ x Vital features and changes captured in unit and/or integration tests
• Commits messages follow AP format
• Extend the documentation, if necessary
• Merging to main from fork:branchname

[coveralls]

coverage: 98.768% (+0.001%) from 98.767%
when pulling aab89af on JamieShorten/AddDependencyOption
into a139d77 on main.