VI-style up/down navigation in commit lists
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=18139) </details> <!--IssueSummary end--> ### Description - Use `j` and `k` on the keyboard to move down and up, respectively, through a list of commits, and then press `Enter` to navigate into the commit. - Similar to VI keyboard shortcuts. - Implement this for (1) commit list view for a branch and (2) commit list view in a merge request. - This allows a person to quickly navigate through a list of commits using just the keyboard, similar to triaging emails in Gmail / Inbox. ### Examples from GitHub - GitHub has this in the branch commit list view and the pull request commit list view. - GitHub has this in their file browser view for file navigation. - GitHub has this in their pull requests list view for navigation. - GitHub has this in their issues list view for navigation. ![2017-05-15_14.17.44](/uploads/107f9863664b377b80d068bccceb76bb/2017-05-15_14.17.44.gif) ### Related - https://gitlab.com/gitlab-org/gitlab-ce/issues/32310 - https://gitlab.com/gitlab-org/gitlab-ce/issues/32311
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