Better dependency graph visualization

[zhulik]

The current dependency tree rendering could be improved

Considerations:

• Services with more dependencies should be rendered higher.
• Services with and without dependencies as well as runners should be distinguishable.
• Services with more dependents should be bigger.
• Services registered as interface and as pointers should be distinguishable.
• Services registered as interfaces should include underlying type name in their labels.
• Runners of different configurations should be distinguishable.
• The fact of implementing Initer and Shutdowner should be reflected.
• etc?