Add support for 44.1khz audio

[sharkeylaser]

Is your feature request related to a problem? Please describe.
Currently, 44.1khz audio options are not present in RVC. Given that it's a common sample rate for CDs, I would think it should be an option.

Describe the solution you'd like
I'd like to see 44.1khz audio be implemented so we don't have to downsample to 40k or upsample to 48k.

Describe alternatives you've considered
n/a

Additional context
I have a ton of audiobooks on CDs that I would like to work with, hence the request to support 44.1khz audio. I would like to take the narrator of one audiobook and use their voice to replace the narrator's voice of another audiobook.