Linting for the conventional commit format.

**Is your feature request related to a problem? Please describe.**
I'm trying to get used to using git [conventional commit format](https://www.conventionalcommits.org/en/v1.0.0/). It would be really nice if lazygit would remind me, encourage me.

**Describe the solution you'd like**
It would be amazing if lazygit would help me by linting for this, for example using this linter [this](https://github.com/conventional-changelog/commitlint).