Replace Submodules with CMake Build Instructions

[nibanks]

Instead of submoduling all the possible dependencies of msquic, should we instead use CMake to dynamically grab/build/install what ever is needed for the current build configuration? I think it would improve things. It would definitely improve CI time for configurations that don't need to openssl.

[anrossi]

I believe the solution has an example here:
https://stackoverflow.com/questions/9689183/cmake-googletest/9695234#9695234

[AndrewGaspar]

Consider a package manager like vcpkg.

[nibanks]

I've decided to leave things as they are for now and just continue to use submodules.