Add "View as Tree" option
Problem to solve
Right now the extension shows the changes of an MR as flat list. Each element in the list has the path next to it. This works pretty well but for bigger mono repos it is hard to review. VSCode itself support the "View as Tree" option in the git diff view. This will show the changes within it's directories
GitLab support this as well
Proposal
Add a button (View as Tree) similar to VSCode diff view to switch between this 2 variants. This would make reviewing in some cases much easier.
Further details
Checkout the git diff view of VSCode with some sub directories to see the effect in action.