samples: bluetooth: classic: add HID Device mouse sample

Add a Bluetooth Classic HID Device sample that demonstrates a mouse
peripheral. The sample registers an SDP HID service record with a
standard mouse report descriptor (3 buttons + X/Y + wheel), waits
for an incoming HID Host connection, and sends periodic input reports
simulating circular cursor movement at 10 Hz.

Features demonstrated:
- HID Device callback registration and SDP service setup
- Boot Protocol and Report Protocol mode support
- Get_Report, Set_Report and Set_Protocol request handling
- Periodic input report transmission on the interrupt channel
- Suspend/Exit-Suspend and Virtual Cable Unplug handling

Tested with a real USB HCI dongle (CSR 4.2) on native_sim,
verified end-to-end with an Android phone as HID Host.

Signed-off-by: Kai Cheng <chengkai@xiaomi.com>

Author: chengkai15

samples/bluetooth/classic/hid_device/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.28.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(hid_device)
+
+target_sources(app PRIVATE src/main.c)

samples/bluetooth/classic/hid_device/README.rst

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+.. zephyr:code-sample:: bluetooth_hid_device
+   :name: Bluetooth: HID Device (Mouse)
+   :relevant-api: bt_hid_device
+
+   Demonstrate a Bluetooth Classic HID Device acting as a mouse.
+
+Overview
+********
+
+This sample implements a Bluetooth Classic HID Device (mouse) that
+advertises itself via SDP and waits for an incoming HID Host connection.
+Once connected, it periodically sends mouse input reports simulating
+circular cursor movement.
+
+The sample demonstrates:
+
+- Registering HID Device callbacks and the HID SDP service record
+- Handling Get_Report, Set_Report and Set_Protocol requests
+- Sending periodic input reports on the interrupt channel
+- Boot Protocol and Report Protocol mode support
+- Suspend/Exit-Suspend and Virtual Cable Unplug handling
+
+Get_Protocol is answered by the host stack and needs no application
+callback.
+
+Requirements
+************
+
+- A board with Bluetooth BR/EDR support
+- A Bluetooth HID Host (e.g., a PC or phone) to connect to the device
+
+Building and Running
+********************
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/bluetooth/classic/hid_device
+   :board: <board>
+   :goals: build flash
+   :compact:
+
+After flashing, the device will initialize Bluetooth, register the HID
+service, and become discoverable. Pair with it from a HID Host to see
+the mouse cursor move in a circle.

samples/bluetooth/classic/hid_device/prj.conf

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+CONFIG_BT=y
+CONFIG_BT_CLASSIC=y
+CONFIG_BT_HID_DEVICE=y
+CONFIG_BT_DEVICE_NAME="hid-mouse"
+CONFIG_BT_COD=0x002580
+CONFIG_BT_PAGE_TIMEOUT=0xFFFF