Add Support for Creating Data Factories

[cmarshall10450]

It would be good to be able to create Data Factories using Farmer. The Data Factory resource itself should be kept separate from the meta-resources such as pipelines, linked services and datasets, as to allow them to be deployed separately from a Data Factory.

All meta-resources should be able to be added to either a DataFactoryBuilder or the ArmBuilder in case the DataFactory itself is not managed by Farmer.

I'd be happy to take this on.