CLI Enhancement: Ability to specify all command parameters in a json file ("command-params-file" flag)

Right now each CLI command accepts a set of command parameters as separate command line flags. It's ok for adhoc use, but it's less ideal for automation. The goal for the "command-params-file" flag is to provide an ability to specify all required command-specific parameters in one JSON formatted file.

There's already a placeholder for the flag, but there's no logic to load and process the file data.

This is a good first issue for somebody already comfortable with Go and refactoring a significant amount of CLI flag processing code.