Parser's parameters renaming.

[kkeroo]

This PR renames parameters in some parsers.

1. Keypoints parser:

• num_keypoints -> n_keypoints

2. MP Palm detection, SCRFD, YuNet parsers:

• score_threshold -> conf_threshold
• nms_threshold -> iou_threshold
• top_k -> max_det

Reason?
This is because some heads in NN archive have some required parameters that need to be set when creating NN Archive. For example, detection head has conf_threshold, iou_threshold, max_det. In the future DAI will be able to automatically map the parameters from archive to parser - that's why naming must be consistent.