maximum & minimum is implemented through a list

Implementation of maximum & minimum is not optimal at all and used a list for most types:

```haskell
instance Collection (BA.Array ty) where
    ...
    minimum = Data.List.minimum . toList . getNonEmpty -- TODO
    ...
```

types having a bad implementation:

* [ ] Block
* [ ] UArray
* [ ] Array
* [ ] String
* [ ] Bitmap
* [ ] ChunkedUArray