Add standalone C++ client build scripts

[jonyMarino]

Fixes: #

About

Squashes the work from internal PR #37 into the public repository.

This PR:

• Adds standalone Linux and Windows build wrappers for the C++ client, independent of SimLibs.
• Moves mocked C++ client unit-test execution into the standalone CMake/CTest flow.
• Updates the C++ client CI workflow to use the new wrappers and trigger on their changes.
• Updates C++ client, setup, and development documentation.
• Fixes C++ client synchronization and topic/API details included in the source work.

How Has This Been Tested?

• git diff --check passed.
• The local C++ build could not be executed because this environment does not have bash, cmake, or ninja installed.
• CI is configured to build the client and run the mocked unit tests on Linux and Windows.

Screenshots and videos (if appropriate):

Not applicable.