🐛 add zeros to complete pncc frames instead of ignoring the last …

[raglady]

Describe the bug

PNCC: When calling the function framing inside spafe/utils/preprocessing.py, we lose the last frame if it is shorter than others instead having it filled by zeros.

To Reproduce

With the code below, we lose the last frame containing the value 20 instead of having it followed by 0 0.

from spafe.utils.preprocessing import framing

sig = [1.0,2.0,3.0,4.0,5.0,6.0,7.0,8.0,9.0,10.0,11.0,12.0,13.0,14.0,15.0,16.0,17.0,18.0,19.0,20.0]

frames, frame_length = framing(
        sig=sig, fs=1, win_len=4, win_hop=3
    )

print(f"frames: {frames}, frames_len: {frame_length}")

Result before fix

frames: [[ 1. 2. 3. 4.]
[ 4. 5. 6. 7.]
[ 7. 8. 9. 10.]
[10. 11. 12. 13.]
[13. 14. 15. 16.]
[16. 17. 18. 19.]], frames_len: 4

Result after fix

frames: [[ 1. 2. 3. 4.]
[ 4. 5. 6. 7.]
[ 7. 8. 9. 10.]
[10. 11. 12. 13.]
[13. 14. 15. 16.]
[16. 17. 18. 19.]
[19. 20. 0. 0.]], frames_len: 4