Description of problem

kata-runtime kata-env only outputs in TOML right now. It would be great if it supported some other formats - for instance, the metrics system currently parses some of that TOML into JSON, and it would be great if we could just take a complete JSON output and store it away with the test results.

Expected result

An option such as kata-runtime kata-env --json to generate JSON formatted output.

One might consider YAML as well - but I did not find an obvious YAML encoder to use, so will stick to JSON additions for now.