merge new qcloud sdk

1. qcloud has a great revolution, the protocol has been changed to implement data template, so the old TencentCloud_SDK developed by us will not work fine now(mqtt still works, but data template will not works fine for recently created product/devices).

2. I merge the official qlcoud sdk(include both the iot-hub and iot-explorer sdk) into the componet/conectivity to support new protocol of data template

3. iot-hub sdk, supply the fundamental iot protocol(like mqtt coap, etc.)
iot-explorer sdk, supply the high level service like data template based on mqtt

4. To know how it works, see qcloud_iot_explorer_sdk_data_template、qcloud_iot_hub_sdk_mqtt example(keil project in board\TencentOS_tiny_EVB_MX_Plus\KEIL\qcloud_iot_explorer_sdk_data_template and  board\TencentOS_tiny_EVB_MX_Plus\KEIL\qcloud_iot_hub_sdk_mqtt)

components/connectivity/TencentCloud_SDK/source/src/port/TencentOS_tiny/osal_os.c

@@ -49,6 +49,10 @@ __QCLOUD_OSAL__ void *osal_mutex_create(void)
     k_mutex_t *mutex;
 
     mutex = (k_mutex_t *)osal_malloc(sizeof(k_mutex_t));
+    if (!mutex) {
+        return K_NULL;
+    }
+
     tos_mutex_create(mutex);
 
     return (void *)mutex;