Graph Design

[jacquesqiao]

• add onnx to VisualDL support onnx as graph data format and add related API #34
• add edge in Graph data format design update data format for graph #32
• impl edge in Graph API

[varunarora]

@jacquesqiao Can you give us an update on the status of this and what needs work (apart from the click interactions stuff)?

[jetfuel]

Close the ticket. This is implemented.