Integration with Conventional Commit for JetBrains IDEs

Hi! I'm the developer of https://github.com/lppedd/idea-conventional-commit, a plugin that offers tokens completion inside the commit dialog in JetBrains IDEs.

I stumbled upon `commitizen` looking at IntelliJ IDEA issues (see [IDEA-161189](https://youtrack.jetbrains.com/issue/IDEA-161189)) and wanted to propose an integration with it. I already support a minimal set of cases for Commitlint, but I'll expand it in the future.

What would be your requirements for a decent UX?