* adding unit testcases for keypoints from_inference(), from_mediapipe() and from_yolo_nas() functions * modifying test_from_mediapipe_input() * Apply suggestions from code review --------- Co-authored-by: Jirka Borovec <6035284+Borda@users.noreply.github.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>