Feature/add who am i and you are services (#1024)

* Added Who-Am-I-Request encoding, decoding, unit tests, and command line application bacwhoami.

* Added You-Are-Request encoding, decoding, unit tests, and command line application bacyouare.

* Added Who-Am-I with Who-Is and You-Are handling into the example server application when run as device 4194303.

src/bacnet/youare.h

@@ -0,0 +1,52 @@
+/**
+ * @file
+ * @brief API for BACnet You-Are service encoder and decoder
+ * @author Steve Karg <skarg@users.sourceforge.net>
+ * @date June 2025
+ * @copyright SPDX-License-Identifier: MIT
+ */
+#ifndef BACNET_YOU_ARE_H
+#define BACNET_YOU_ARE_H
+
+#include <stdint.h>
+#include <stdbool.h>
+/* BACnet Stack defines - first */
+#include "bacnet/bacdef.h"
+#include "bacnet/bacstr.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+BACNET_STACK_EXPORT
+int you_are_request_encode(
+    uint8_t *apdu,
+    uint32_t device_id,
+    uint16_t vendor_id,
+    const BACNET_CHARACTER_STRING *model_name,
+    const BACNET_CHARACTER_STRING *serial_number,
+    const BACNET_OCTET_STRING *mac_address);
+
+BACNET_STACK_EXPORT
+int you_are_request_decode(
+    const uint8_t *apdu,
+    size_t apdu_size,
+    uint32_t *device_id,
+    uint16_t *vendor_id,
+    BACNET_CHARACTER_STRING *model_name,
+    BACNET_CHARACTER_STRING *serial_number,
+    BACNET_OCTET_STRING *mac_address);
+
+BACNET_STACK_EXPORT
+int you_are_request_service_encode(
+    uint8_t *apdu,
+    uint32_t device_id,
+    uint16_t vendor_id,
+    const BACNET_CHARACTER_STRING *model_name,
+    const BACNET_CHARACTER_STRING *serial_number,
+    const BACNET_OCTET_STRING *mac_address);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif