Include metadata when listing packages to json and verbose enabled

[flashk]

What's the problem this feature will solve?

I would like access to additional package information (author, summary, homepage, ...) when using the list command to output to JSON.

Describe the solution you'd like

When the --format json and --verbose options are provided to the list command, it will add an additional metadata field to the JSON output containing the metadata_dict attribute of the distribution. This would involve adding the following line when outputting to JSON, similar to how inspect outputs the metadata:

info["metadata"] = dist.metadata_dict

Alternative Solutions

The inspect command will output the metadata, so I can combine that with the output from list. However, it would be convenient to just get all the information in a single call when using list.

Additional context

No other context

Code of Conduct

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