feat: add Portable Git to Windows installer

[cin-albert]

Description

• Add Portable Git to Windows's installer
• Advantages:
  • Portable Git allows using Git without installer and won't affect the system-wide Git. This will help isolate our Git completely.
• Drawbacks:
  • Need to install 7zip to extract Git, which makes the installer more lengthy and ambiguous.
• Resolve #171

Type of change

• [x] New features (non-breaking change).
• [ ] Bug fix (non-breaking change).
• [ ] Breaking change (fix or feature that would cause existing functionality not to work as expected).

Checklist

• [x] I have performed a self-review of my code.
• [ ] I have added thorough tests if it is a core feature.
• [x] There is a reference to the original bug report and related work.
• [x] I have commented on my code, particularly in hard-to-understand areas.
• [ ] The feature is well documented.