freertos: Refactor component structure

This commit refactors the "freertos" component's structure as follows:

- "FreeRTOSConfig.h" related files moved to "./config" directory
- Refactored CMakeLists.txt file in preparation for v10.5.1 upgrade
    - Grouped list appends based on component organization
    - Removed some unecessarily public "include_dirs"
- Removed FreeRTOS-openocd.c
    - uxTopUsedPriority has been added back to tasks.c since v10.4.2
    - Thus the workaround in FreeRTOS-openocd.c is no longer needed and can
      be removed.

components/freertos/FreeRTOS-Kernel-SMP/include/freertos/task.h

@@ -3321,7 +3321,7 @@ core 0 during startup.
 void vTaskStartSchedulerOtherCores( void );
 #endif // configNUM_CORES > 1
 
-#include "idf_additions.h"
+#include "freertos/idf_additions.h"
 
 #endif //ESP_PLATFORM