Add AdbRunner for adb CLI operations

- AdbRunner: Device management, server control
- AndroidDeviceInfo: Model for device metadata with state/transport enums

API:
- GetDevicesAsync(): List connected devices and emulators
- StartServerAsync(): Start ADB server
- KillServerAsync(): Stop ADB server
- WaitForDeviceAsync(): Wait for device to be ready
- GetDevicePropertyAsync(): Query device properties

Addresses #279

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: rmarinho

src/Xamarin.Android.Tools.AndroidSdk/Models/AndroidDeviceInfo.cs

@@ -0,0 +1,103 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Collections.Generic;
+
+namespace Xamarin.Android.Tools
+{
+	/// <summary>
+	/// Device type classification.
+	/// </summary>
+	public enum AndroidDeviceType
+	{
+		Physical,
+		Emulator
+	}
+
+	/// <summary>
+	/// Device connection state.
+	/// </summary>
+	public enum AndroidDeviceState
+	{
+		Unknown,
+		Device,      // Connected and ready
+		Offline,     // Device is offline
+		Unauthorized, // USB debugging not authorized
+		Bootloader,  // Device is in bootloader mode
+		Recovery,    // Device is in recovery mode
+		Sideload     // Device is in sideload mode
+	}
+
+	/// <summary>
+	/// Information about a connected Android device or running emulator.
+	/// </summary>
+	public class AndroidDeviceInfo
+	{
+		/// <summary>
+		/// Device serial number (e.g., "emulator-5554", "R3CN90XXXXX").
+		/// </summary>
+		public string Serial { get; set; } = string.Empty;
+
+		/// <summary>
+		/// Display name of the device.
+		/// </summary>
+		public string? Name { get; set; }
+
+		/// <summary>
+		/// Device manufacturer (e.g., "Google", "Samsung").
+		/// </summary>
+		public string? Manufacturer { get; set; }
+
+		/// <summary>
+		/// Device model (e.g., "Pixel 6", "sdk_gphone64_arm64").
+		/// </summary>
+		public string? Model { get; set; }
+
+		/// <summary>
+		/// Android SDK/API version (e.g., "35", "34").
+		/// </summary>
+		public string? SdkVersion { get; set; }
+
+		/// <summary>
+		/// Android release version (e.g., "15", "14").
+		/// </summary>
+		public string? ReleaseVersion { get; set; }
+
+		/// <summary>
+		/// CPU ABI (e.g., "arm64-v8a", "x86_64").
+		/// </summary>
+		public string? Abi { get; set; }
+
+		/// <summary>
+		/// Device type (physical or emulator).
+		/// </summary>
+		public AndroidDeviceType Type { get; set; }
+
+		/// <summary>
+		/// Device connection state.
+		/// </summary>
+		public AndroidDeviceState State { get; set; }
+
+		/// <summary>
+		/// Whether this is an emulator.
+		/// </summary>
+		public bool IsEmulator => Type == AndroidDeviceType.Emulator;
+
+		/// <summary>
+		/// Whether the device is connected and ready.
+		/// </summary>
+		public bool IsOnline => State == AndroidDeviceState.Device;
+
+		/// <summary>
+		/// AVD name if this is an emulator.
+		/// </summary>
+		public string? AvdName { get; set; }
+
+		/// <summary>
+		/// Additional device properties from getprop.
+		/// </summary>
+		public Dictionary<string, string> Properties { get; set; } = new Dictionary<string, string> ();
+
+		public override string ToString () => $"{Serial} ({Model ?? Name ?? "Unknown"}) - {State}";
+	}
+}