[PV][fix] Fix the nb of threads interface in kpts extractor

Goal

Before this MR, the PV interface didn't pass the number of threads to the keypoints extractor.

Changes

• Add a setter for number of threads to set the number of threads in the SLAM manager and in the keypoints extractor
• Add the init of the number of threads when the keypoints extractor is set

Results

Reproduce

Data

Any pcap

Build

Build LV

Parameters

• Change the parameters :
  • nb_threads = 5 or 1

Run

Open LV Check the number of threads is passed to the extractor