Add a column that renders the "complexity" of the change.

[bgianfo]

It would be nice if there was a small overview of the "complexity" of a pull request, how many lines added, removed, edited, etc..

[bgianfo]

I started looking into this, see ChangeSize in src/Views/PullRequestViewElement.cs.
However what ever API I'm using to fetch the pull requests doesn't seem to populate the commit list?

Maybe we have to call a subsequent API on the pull request ID to fetch more data?