Improve Waltz diagramming functionality

[kamransaleem]

Starting a discussion to get input on improved diagramming support in Waltz

Goals:

1. Generate well formatted, pretty diagrams from existing Waltz entities - Layout should be automatic
2. Diagrams should include relevant / interesting data points as annotations
3. Ability to export diagrams

any other points welcome.

Related issue #7066 raised by @judepayne

Would like feedback on use cases and requirements on this functionlity and / or suggestions?