[ENH] Add rticonnextdds-cmake-utils repository as a git-submodule

[lulivi]

Enhancement description

Have all the common CMake modules (used in various repositories) as a git-submodule.

This submodule will be placed in resources/cmake/rticonnextdds-cmake-utils. In order to give an automated CMake build system configuration, we will create a module inside resources/cmake/Modules with a macro to update and init the git-submodule if necessary.

In all the CMakeLists scripts, we will need the call of this macro, to ensure the correct building of the C/C++ examples.