add cmake for tango plugin installation
CMakeLists.txt does not manage the installation of the tango camera plugin and the conda recipe (conda/tango) does a dirty copy of the file .py to the python installation directory. We propose to add a CMakeLists.txt file for tango/ and use cmake for both installating .py when developing and when running gitlab-ci pipeline for package deployment. When running cmake from lima or camera project directory, the LIMA_ENABLE_PYTANGO_SERVER state will tell cmake if it can install or not the tango camera plugin file(s).