Execute key sequence from command line

Lazygit's undo feature really helped me out recently (thanks!). Using the reflog is something I'm still not good at in git, but lazygit made it easy to get back to where I wanted.

I thought it'd be useful if I could make a command-line call to that feature in lazygit, so I could make an alias like "git undo". But, I didn't see a way to call into lazygit's features from the command line.

Would it make sense for lazygit to take a command, so that one could create an alias like:

```shell
alias git-undo="lazygit -C 'z'"
alias git-redo="lazygit -C 'ctrl+z'"
```

With that, maybe it'd be possible to script git using lazygit by providing a sequence of commands.