Continue work on improving and streamlining the IO

[JRavi2]

It would be better if all the IO-related functionality is localized to the chat_analyzer.py file as much as possible.
Some work on this has already been done on the streamline-io branch.

[anitmangal]

I could try handling this activity.

[JRavi2]

@anitmangal Great! Assigning it to you :)