Git config message template

**Is your feature request related to a problem? Please describe.**
When we work on Jira tickets all commit messages need to be prepended with the ticket number. For normal `git commit` usage I have created a script that creates a new branch `feature/[TICKET NUMBER]` and also sets the global git commit message template where the ticket number is added. Lazygit does not pick up this template, but this would be a very welcome addition.

**Describe the solution you'd like**
When a (global) commit message template is set, it is automatically inserted in the input boxes in the commit window.