Add TQDM progress bar for Jupyter Notebook pandas_to_eland() calls

- https://github.com/tqdm/tqdm#ipythonjupyter-integration
- Units are rows/s
- Maybe hide progress bar on completion? Need to test it out first.
- Add an option `show_progressbar` which defaults to `None`
  - If `None` show a progress bar only if we detect Jupyter Notebook
  - If `False` don't show a progress bar
  - If `True` show a progress bar only if we detect Jupyter Notebook (for now)