add sink functionality to base task class

[satra]

• What would you like changed/added and why?

It would be good to be able to send the data at the end of a run to a specific location, server, stream. this should also allow renaming outputs using a template, thus this feature could combine datasink and rename into a task property.

• What would be the benefit? Does the change make something easier to use?

data could be streamed as each task is finished rather than waiting for an entire workflow to be run. this can enable triggering other services.