Feature: Add git repo section to the sidebar (discussion)

### What feature or improvement do you think would benefit Files?

Microsoft is adding a git section to the File Explorer sidebar and considering we're in the midst of working on our own git integration, it's a good time to work on this feature.

### Requirements

- Add git section to the sidebar (off by default)
- Add setting to the Developer Tools page to select folders to scan for repos
- Alternatively, instead of a setting to scan for repos, simply show pinned git repos under the dedicated sidebar section.

### Files Version

v2.4.82

### Windows Version

Windows 11

### Comments

_No response_