chore: update CMake dependency configurations to remove PARENT_SCOPE

- Removed PARENT_SCOPE from various dependency target definitions in CMake files (grpc.cmake, imgui.cmake, sdl2.cmake, testing.cmake, yaml.cmake).
- Ensured that all targets are set locally for better clarity and management.

Benefits:
- Simplifies the dependency management process and improves the readability of CMake configurations.

cmake/dependencies/yaml.cmake

@@ -13,7 +13,7 @@ if(YAZE_USE_SYSTEM_DEPS)
     message(STATUS "Using system yaml-cpp")
     add_library(yaze_yaml INTERFACE IMPORTED)
     target_link_libraries(yaze_yaml INTERFACE yaml-cpp)
-    set(YAZE_YAML_TARGETS yaze_yaml PARENT_SCOPE)
+    set(YAZE_YAML_TARGETS yaze_yaml)
     return()
   endif()
 endif()