[confcom] Add a subcommand to convert inputs to JSON

[DomAyre]

Currently, acipolicygen takes JSON as the simplest input describing the features which define the policy to be generated, such as the image, container environment etc.

The tool also takes more complex input which describes whole deployments and parses it to json as an intermediate representation.

We have an internal customer asking for the ability to output this intermediate representation.

[yonzhan]

Thank you for opening this issue, we will look into it.

[DomAyre]

@yonzhan Thanks for such a quick response, but don't worry it's already being worked on, I just wanted to encapsulate the work here