Update yaml-cpp dependency handling

 - Added CPM fallback in case package is not found automatically.
 - Using yaml-cpp::yaml-cpp target instead of yaml-cpp to silence deprecation
   warnings on newer cmake versions.

common/config/yaml/CMakeLists.txt

-find_package(yaml-cpp REQUIRED PATHS /usr/lib/aarch64-linux-gnu/pkgconfig/)
-# include(FetchContent)
-
-# FetchContent_Declare(
-#   yaml-cpp
-#   GIT_REPOSITORY https://github.com/jbeder/yaml-cpp.git
-#   GIT_TAG 0.8.0
-# )
-# FetchContent_GetProperties(yaml-cpp)
-
-# if(NOT yaml-cpp_POPULATED)
-#   message(STATUS "Fetching yaml-cpp...")
-#   FetchContent_Populate(yaml-cpp)
-#   add_subdirectory(${yaml-cpp_SOURCE_DIR} ${yaml-cpp_BINARY_DIR})
-# endif()
+find_package(yaml-cpp)
+if (NOT yaml-cpp_FOUND)
+  CPMAddPackage("gh:jbeder/yaml-cpp#yaml-cpp-0.7.0@0.7.0")
+else()
+  if (NOT TARGET yaml-cpp::yaml-cpp)
+    add_library(yaml-cpp::yaml-cpp ALIAS yaml-cpp)
+  endif()
+endif()
 
 add_library(params_yaml_static config_yaml.cpp)
-target_link_libraries(params_yaml_static PUBLIC UTIL yaml-cpp)
+target_link_libraries(params_yaml_static PUBLIC UTIL yaml-cpp::yaml-cpp)
 if (ENABLE_TESTS)
   add_subdirectory(tests)
 endif()
 
 add_library(params_yaml MODULE config_yaml.cpp)
-target_link_libraries(params_yaml PUBLIC UTIL yaml-cpp)
+target_link_libraries(params_yaml PUBLIC UTIL yaml-cpp::yaml-cpp)
 set_target_properties(params_yaml PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})