Porting to Godot 4

The [`godot4` branch](https://github.com/git-learning-game/oh-my-git/compare/godot4...main) is a [behind](https://github.com/git-learning-game/oh-my-git/compare/godot4...main) `main` by 10 commits. Are there any plans to rebase and revive it?

What are the main obstacles to make `oh-my-git` run on Godot 4?