[mlpack-git] [mlpack/mlpack] DatasetMapper & Imputer (#694)

[Tham]

>     */
> -  DatasetInfo(const size_t dimensionality = 0);
> +  DatasetMapper(const size_t dimensionality = 0);

Let the constructor store MapPolicy, so we could save some state and allow us to tell the DatasetMapper we do not want to map non target string(ex : NaN, empty string and so on) to categorical.

```
DatasetMapper(const size_t dimensionality = 0, MapPolicy mapPolicy) : 
  dimensionality(dimensionality),
   mapPolicy(std::move(mapPolicy))
{}
```

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