Python package release check-list

[oleksandr-pavlyk]

This issue pens down issues that should be addressed prior to release of Python API of NVBench.

• Fix Ctrl-C interrupt behavior pynvbench: Need to repeatedly Ctrl-C to stop pynvbench script #284
• Make doc-strings conveniently available Python entities of Python API to NVBench should have docstrings #291
• Python API should ensure backward compatibility behavior and run with older driver versions NVBench should not make direct calls to driver API #292

[oleksandr-pavlyk]

@leofang @shwina @alliepiper @jrhemstad @gevtushenko for viz