Create functional tests for all V1 Data Transformation scenarios

[rogancarr]

As laid out in #2498 , we need scenarios to cover the Data Transformation functionality we want fully supported in V1.

• Extensible transformation: It should be possible to write simple row-mapping transforms.
  Examples: "I can add custom steps to my pipeline such as creating a new column that is the addition of two other columns, or easily add cosine similarity, without having to create my own build of ML.NET.
• I can modify settings in the TextFeaturizer to update the number of word-grams and char-grams used along with things like the normalization.      
• I can apply normalization to the columns of my data