[scripts] Adding scripts to easily evaluate the latency of models

[fg-mindee]

As discussed, we need to provide means to accurately evaluate the latency of models in a given environment. This comes with several challenges and questions:

• 1 script per framework?
• 1 script per task? (text detection, object detection, text recognition)
• should we benchmark the predictor or the DL model only? (for OCR we don't have any end-to-end DL model for instance, so that )

I would suggest focusing on mid-level tasks (excluding OCR for now since we don't have an end-to-end archi) and implementing:

• Text Detection benchmark script (feat: Added latency evaluation scripts for all tasks #746)
• Text Recognition benchmark script (feat: Added latency evaluation scripts for all tasks #746)
• Object Detection benchmark script (feat: Added latency evaluation scripts for all tasks #746)

What do you think @charlesmindee?