Please add .wav option for save_audio node

### Feature Idea

The save_audio node currently just saves a .flac file. The compatibility with audio players and video editors is quite poor.

Having an option for .wav output would be really useful. Might just add an asterisk or something about the lack of a workflow with that option (if .wav isn't suitable to store readable workflows in metadata I mean) but it would make it actually a usable and useful node.

Thanks

### Existing Solutions

_No response_

### Other

_No response_