feat(rt/posix): Added FreeRTOS-Plus-POSIX message queues implementation

Note: The current mq_open() implementation is changed to match
      the POSIX standard.

.gitlab/CODEOWNERS

@@ -140,6 +140,7 @@
 /components/protocomm/                @esp-idf-codeowners/app-utilities/provisioning
 /components/pthread/                  @esp-idf-codeowners/system
 /components/riscv/                    @esp-idf-codeowners/system
+/components/rt/                       @esp-idf-codeowners/system
 /components/sdmmc/                    @esp-idf-codeowners/storage
 /components/soc/                      @esp-idf-codeowners/peripherals @esp-idf-codeowners/system
 /components/spi_flash/                @esp-idf-codeowners/peripherals

components/rt/CMakeLists.txt

@@ -0,0 +1,13 @@
+idf_build_get_property(target IDF_TARGET)
+if(${target} STREQUAL "linux")
+    idf_component_register()
+    if(NOT CMAKE_HOST_SYSTEM_NAME STREQUAL "Darwin")
+        find_library(LIBRT rt)
+        target_link_libraries(${COMPONENT_LIB} INTERFACE ${LIBRT})
+    endif()
+    return()
+endif()
+
+idf_component_register(SRCS "FreeRTOS_POSIX_mqueue.c" "FreeRTOS_POSIX_utils.c"
+                    PRIV_INCLUDE_DIRS "private_include"
+                    INCLUDE_DIRS "include")