[code_review] Implement a way to reduce the number of comments based on importance

[marco-c]

Some of our users want to see fewer comments than others, we could introduce a "verbosity level" setting to control the number of comments that get published.
This way, for people who only want to see few comments, we can cut the list of comments in the output. We could have another step after filtering that sorts by importance of the comment, and only show the top X, where X depends on the verbosity level setting.

As a follow-up, we could optimize the default verbosity level based on the percentage of accepted comments on each ranking.

This could be useful for noise reduction even if we don't expose the option to users.