Deprecate UARTService

UARTService is rarely used and has not been actively updated.

Author: LDong-Arm

features/FEATURE_BLE/ble/services/UARTService.h

@@ -41,9 +41,15 @@ extern const uint8_t  UARTServiceTXCharacteristicUUID[UUID::LENGTH_OF_LONG_UUID]
 extern const uint8_t  UARTServiceRXCharacteristicUUID[UUID::LENGTH_OF_LONG_UUID];
 
 /**
-* @class UARTService.
-* @brief BLE Service to enable UART over BLE.
-*/
+ * @class UARTService.
+ * @brief BLE Service to enable UART over BLE.
+ *
+ * @deprecated This service is deprecated, and no replacement is currently available.
+ */
+MBED_DEPRECATED_SINCE(
+    "mbed-os-5.13",
+    "This service is deprecated, and no replacement is currently available."
+)
 class UARTService {
 public:
     /** Maximum length of data (in bytes) that the UART service module can transmit to the peer. */