Add Git Branch Pattern property

[Zelnes]

Prerequisites

• I have read and understood the contributing guide.
• The commit message follows the conventional commits guidelines.
• Tests for the changes have been added (for bug fixes / features).
• Docs have been added/updated (for bug fixes / features).

Description

This proposal aims to give control over the branch name that is extracted, with regular expressions.

I am not familiar with Go, but tried my best.

In my workflow, I usually have long branch name (such as feature/PROJECT-12345-scope-of-ticket), and while interacting in the terminal, I don't really care about the scope. This feature allows me to extract only the issue part, and can still be combined with the mapping_branches.

Can't wait to have feedback, and hopefully see something like this in the project, which is great btw, good job !

Also, I have to say that the setup was pretty easy, thanks to the devcontainer. 👍

Question

Is the documentation/schema aimed to be edited by hand ? Or is there anything I missed to handle this automatically ?
I felt it hard to write this part, mainly due to alignment.