Commented Unassigned: Make SampleProviderConverters public [16404]

SampleProviderConverters seems like useful class, but declared as internal (by default):

```
static class SampleProviderConverters
```

It is possible make it "public" in future release?
Comments: I didn't realise it wasn't public, but I've actually added a ToSampleProvider extension method on IWaveProvider, which is intended to be a much easier way to make use of these.