need Number of CPU cores used used for pitch extraction and dataset processing Options

[JackEllie]

When I use Crepe for pitch extraction, it consumes too much VRAM. In the traditional RVC interface, there is an option to adjust the "Number of CPU cores used for pitch extraction and dataset processing." However, this option is not available in Applio. Perhaps we should add it back or include this option in the settings?

[blaisewf]

planned in the future

[aitronz]

Added https://github.com/IAHispano/Applio/commit/5e302727f2b844e33503afb6cdba3a1945c76527