[IMPROVEMENT] Allow to pass --x-install-root to vcpkg

### Please confirm these before moving forward.

- [x] I have searched for my feature proposal and have not found a work-in-progress/duplicate/resolved/discarded issue.
- [x] This improvement refers to an existing feature. If you want to suggest a new feature, please use [this template](https://github.com/marticliment/WingetUI/issues/new?assignees=marticliment&labels=new-feature&projects=&template=feature-request.yml&title=%5BFEATURE+REQUEST%5D+%28Enter+your+description+here%29).
- [x] This improvement is not a bug. If you want to report a bug, please use [this template](https://github.com/marticliment/WingetUI/issues/new?assignees=marticliment&labels=bug&projects=&template=bug-issue.yml&title=%5BBUG%5D+%28Enter+your+description+here%29).

### Describe the improvement

I don't use the default location for installing vcpkg packages. Therefore, when I want to update them, I have to pass the `--x-install-root` argument to the vcpkg executable. It turns out that the uniget interface doesn't allow you to customize the package destination.

So, I have to run manually this command to update my vcpkg packages:
`.\vcpkg.exe upgrade --x-install-root=E:\Home\Important\Development\Library\vcpkg_installed --no-dry-run`

### Describe how this improvement could help users

This enhancement will enable users to keep their vcpkg packages up to date even when they are installed in a specific folder.