Add the ability to view all comments across all commits and pull requests for a file in a Repo

There are multiple pull requests and multiple commits for a file.
What would be good is have the ability to aggregate comments from all commits and pull requests for a given file, so you can see them all comments in one place.
This provides a good way to look at past comments when you work on a file or with the code.
Otherwise, all the good thoughts are buried in some commit or pull request that were intended for collaboration.