Track renamed files in the custom commands

**Is your feature request related to a problem? Please describe.**
When creating the custom command "[Comparing a file in a previous revision with the working copy](https://github.com/jesseduffield/lazygit/wiki/Custom-Commands-Compendium#comparing-a-file-in-a-previous-revision-with-the-working-copy)", I noticed that `{{.SelectedCommitFile.Name}}` doesn't work if a file has been renamed.

**Describe the solution you'd like**
A property like `{{.SelectedCommitFile.CurrentName}}` or similar, that traces all the renames of the file between all the commits, and gives me the name of that file in my current working tree.

**Describe alternatives you've considered**
I didn't consider any alternative TBH, but I suspect that this feature request is also closely related to bug #2141

**Additional context**
Add any other context or screenshots about the feature request here.