Refactor folder (#10475)

Move many third-party components' source codes from the src folder to a new folder called deps_src. The goal is to make the code structure clearer and easier to navigate.

deps_src/mcut/cmake/add_FetchContent_MakeAvailable.cmake

@@ -0,0 +1,7 @@
+macro(FetchContent_MakeAvailable NAME)
+  FetchContent_GetProperties(${NAME})
+  if(NOT ${NAME}_POPULATED)
+    FetchContent_Populate(${NAME})
+    add_subdirectory(${${NAME}_SOURCE_DIR} ${${NAME}_BINARY_DIR})
+  endif()
+endmacro()