Add an option to vertically format imports

I was wondering if stylish haskell has currrently some way to have the imports with the next layout:

``` Haskell

import OnlineATPs.Defaults ( getDefaults )
import OnlineATPs.Options
( Options
( optATP
, optHelp
, optATPList
, optTime
, optVersion
, optInputFile
)
, processOptions
, printUsage
)
```

With the settings by default I have this output:

``` Haskell
import OnlineATPs.Defaults (getDefaults)
import OnlineATPs.Options (Options (optATP, optATPList, optHelp, optInputFile, optTime, optVersion),
printUsage, processOptions)

```