Enhancement: additional output formats when comparing archives with baselines

[ubiratansoares]

Right now, compare will output differences between archives and baselines only to stdout and plain text.

However, it'd useful to have different (structured) formats - eg json- so the output can be post-processed afterward. That would enable an enriched PR decoration for example. On Github Actions:

aaw compare -a app/build/output/release/my.apk -b my.org.product.toml --json > comparison.json

# Convert with tools like https://github.com/haltcase/tablemark-cli or in bash with jq
markdown=$(convert_to_markdown comparison.json) 

gh pr comment ${{ github.event.pull_request.number }} --body "$markdown" --edit-last

In addition, we could output markdown directly.