Support for gitmoji

**Is your feature request related to a problem? Please describe.**
Well, its a minor convenience right now, but feel that it would help a lot in standardizing commit messages.
Would like to integrate gitmoji in the commit flow, based on a config flag.

**Describe the solution you'd like**
Those who enable the feature can use the gitmoji cli within the commit window.
Gitmoji-cli(https://github.com/carloscuesta/gitmoji-cli) already has a clear interactive flow.
We can have a tab based form(like html) that can tab through gitmoji, scope, commit title, message

I understand this would be hard and time consuming to implement. Another way to do this is to use the git hooks feature of gitmoji. The hook is triggered on git commit. I believe this is something I myself can implement given some guidance.

**Describe alternatives you've considered**
Currently, I am exiting lazygit and then committing in the shell before re-entering lazygit to push changes.

**Additional context**
How Gitmoji CLI looks