[add] benchmark function to get inference time and output of some GraphView

Context

This MR is part of aidge_core#262 to add a benchmark system.

Major modifications

• add: benchmark.py with functions to run a GraphView and return its execution time and output in the wider context of benchmark.

changed milestone to %aidge v0.6.0

added Feature 🚀 LanguagePython StatusReview Ready labels

assigned to @pineapple

merged