Add an option to automatically extract and save weights when saving checkpoints

[Tiger14n]

Just a suggestion that i think would help a lot, to add an option that extracts and saves a weight file automatically when saving a checkpoint, ./weights/$experimentName_$steps.pth, to easily watch and read progress

[RVC-Boss]

ok, next version

[tomakorea]

Good idea !

[RVC-Boss]

Done. You can update RVC to use this feature.