Make vcpkg a submodule for druid.

**Is your feature request related to a problem? Please describe.**
We currently use FetchContent within cmake to acquire vcpkg. This works for the most part but causes a dependency on cmake and configuring druid to "activate" vcpkg. This will be an issue with pipelines and automation when we need vcpkg to acquire cmake for us.

**Describe the solution you'd like**

- [ ] Remove the vcpkg fetch content cmake from [CMakeLists.txt(./CMakeLists.txt)
- [ ] Add vcpkg as a submodule for tag "2025.09.17" and locate it at the root of this project.
- [ ] Update [use-vcpkg.json](./cmake/preset/use-vcpkg.json) to point to correct vcpkg location.
- [ ] Update .github/workflows yml files to perform a checkout with submodules to acquire vcpkg.

**Describe alternatives you've considered**
Moving on from older consideration to this implementation.

**Additional context**
Add any other context or screenshots about the feature request here.