Need an event from the cmake extension api when a project is added

When a project is added to a multi-root workspace, the CppProject attempts to retrieve the corresponding CMake project using the CMake extension API. However, this process is not synchronized via event handlers, leading to a timing issue where CppProject cannot access the CMake project because it has not yet been generated.

Proposed Solution:
To resolve this, the CMake extension API needs to provide an event to notify when a CMake project has been generated or is ready. This event would allow CppProject to synchronize its operations and ensure the CMake project is accessible before proceeding.