Feature request: emit license-report as JSON

[wenkokke]

For further processing, e.g., fetching all the license texts to build a license.txt file, it would be great if cabal-plan could emit the license-report as JSON.

Would it be possible to add a --json flag to the license-report subcommand?

I assume the implementation effort would be minimal, since we can presumable just convert the data structure used by the license report to json, rather than printing it as Markdown?

[wenkokke]

This functionality is partly covered by the --licensedir flag, but:

• it doesn't provide other information, such as the license name;
• it doesn't provide an easy way to download licenses that are not included in the license directory,
  such as those packages that are bundled with GHC.