fromList for mutable arrays

It would useful to have a function like

```hs
mutableArrayFromListN :: PrimMonad m => Int -> [a] -> m (MutableArray (PrimState m) a)
```

given that there already exists

```hs
arrayFromListN :: Int -> [a] -> Array a
```

My particular use case is also more directly expressed by `generate`, but I understand if this is too much for this library.

```hs
generate :: PrimMonad m => Int -> (Int -> a) -> m (MutableArray (PrimState m) a)
```