Q: How to load from CSV file to DataView based on DataViewSchema?

I can load from Enumerable using DataViewSchema:
```
MLContext mlContext = new MLContext();
ITransformer model = mlContext Model.Load(ModelZipPath, out DataViewSchema ModelInputSchema);
var trainingDataview = mlContext.Data.LoadFromEnumerable(inputs, ModelInputSchema);
```

If some cases, we might not have the object class available, and we want to load from a file:
` mlContext.Data.LoadFromTextFile()`

In this case, there is no overload accepting DataViewSchema. TextLoader.Options has a Columns property, but it is of type Microsoft.ML.Data.TextLoader.Column[] while DataViewSchema inherits from IEnumerable

I suppose it is possible to manually create new TextLoader.Column object from DataViewSchema, but is there a better inteded way?

If not, then perhaps TextLoader.Columns could have a .FromDataViewSchema(schema) overload.