New option for `list_align` for imports

For example I would like to format imports as follows:

```haskell
import qualified Network.HTTP.Client.Internal.Types as Client (Request, host, method, path, port,
queryString, requestBody, requestHeaders)
```

But with current options, I can make it look either like this

```haskell
import qualified Network.HTTP.Client.Internal.Types as Client (Request, host, method, path, port,
queryString, requestBody,
requestHeaders)
```

or like this:

```haskell
import qualified Network.HTTP.Client.Internal.Types as Client
(Request, host, method, path, port, queryString, requestBody, requestHeaders)
```

or

```haskell
import qualified Network.HTTP.Client.Internal.Types as Client (Request, host, method, path, port,
queryString, requestBody,
requestHeaders)
```

None of the existing solutions satisfies what I would like to see. Is it possible to add the option to align imports lines with fixed indentation not depending on the module name length (but also not to start with the new line each time even for 1-line imports)?

Start by locating the list_align option and the import-formatting entry point in stylish-haskell. Compare the requested fixed indentation with the existing alignment modes, then identify the relevant formatter tests or add coverage for one-line and wrapped imports; done means the new option produces the requested indentation without forcing one-line imports onto a new line.

Written by the indexing model from the issue text.