support auto-complition for emoji

**Is your feature request related to a problem? Please describe.**
no

**Describe the solution you'd like**
please support emojis for commit messages. whenever we press `:` in the commit modal, let's open a dialog for emojis and select one of them.
the list of good emojis presented [here](https://gitmoji.dev/)

**Describe alternatives you've considered**
vscode and some other git or text editors have similar plugins [like this](https://marketplace.visualstudio.com/items?itemName=seatonjiang.gitmoji-vscode)