Use GraphView.getOrderedNodes instead of ad-hoc topological sorts

I have noticed a lot of functions are parsing graphviews in order to explore it in a topological order

• ONNX export
• GraphView.forwardDims
• GraphView.forwardDType
• set_qdq

This function would allow to mutualize this parsing logic.

This would allow to have an order without using a Scheduler and thus with not requiring an implementation