Output CSVLogger callback to a tabular file

[anuprulez]

The PR adds an output dataset for displaying training logs if selected as a callback in the Keras model builder tool.

To use it, one needs to select the CSVLogger callback in the "Keras Model Builder" tool and then in the "Deep learning training and evaluation conduct deep training and evaluation either implicitly or explicitly", check the "Display CSVLogger if selected as a callback in the Keras model builder tool" checkbox.

"Keras Model Builder" tool

"Deep learning training and evaluation conduct deep training and evaluation either implicitly or explicitly" tool

ping @qiagu @kxk302. Can you look at this feature and provide your feedback?

Thanks

[bgruening]

Its completely optional, so I don't see how this can harm. Lets get it in.

[anuprulez]

Thanks @bgruening