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

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

components/rt/test_apps/posix_rt_test/main/main.c

@@ -0,0 +1,36 @@
+/*
+ * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Unlicense OR CC0-1.0
+ */
+
+#include <stdio.h>
+#include <time.h>
+#include "unity.h"
+#include "unity_test_runner.h"
+#include "unity_test_utils_memory.h"
+#include "esp_log.h"
+
+static const char *TAG = "Linux_sim";
+
+void setUp(void)
+{
+    unity_utils_set_leak_level(0);
+    unity_utils_record_free_mem();
+}
+
+void tearDown(void)
+{
+    unity_utils_evaluate_leaks();
+}
+
+void app_main(void)
+{
+    // The following code avoids memory leaks from initializing libc structures in clock_gettime() calls.
+    struct timespec tp;
+    clock_gettime(CLOCK_REALTIME, &tp);
+    (void) tp;
+
+    ESP_LOGI(TAG, "Running FreeRTOS Linux test app");
+    unity_run_menu();
+}