Provider a vcpkg port for onnxruntime for easier builds and linking into external projects.

There's an initial effort made that can be used as a starting template for this
microsoft/vcpkg#14903
This port succeeds for x64-windows-static-md but none of the other standard triplets.

Overall the onnxruntime cmakelist.txt needs cleaning to support such a port in an efficient manner

• Allow for submodules to be optional
• Submodule binaries must be picked up using find_package, find_library
• Export standard cmake-config/cmake-target files for easier find_package(onnxruntime) support