Issue #1758

Issue #1758

- Separate out the logic for getting the data from DataONE from the logic for downloading that data onto the user's machine.
- Allows us to use the same data fetching logic in other parts of the app, i.e. the DataONEObjectView.
- Also separate out the logic for getting the file name.
- Add a tests for the new functions

Issue #1758

- MVP, shows CSVs in a table (no other file types yet, no loading spinner, or error handling)
- Ensure TableEditorView returns the view from render()

Issue #1758