Add Emulator runner (emulator CLI)

[rmarinho]

Summary

Add EmulatorRunner class to Xamarin.Android.Tools.AndroidSdk to wrap emulator CLI operations for starting and managing Android emulators.

Background

The MAUI DevTools CLI and IDE extensions need to start emulators, wait for boot completion, and manage emulator lifecycle. This functionality should live in the shared android-tools package.

Proposed API Surface

csharp public class EmulatorRunner { Process StartEmulator(string avdName, IEnumerable<string>? additionalArgs = null); Task<bool> WaitForBootAsync(string serial, TimeSpan timeout, CancellationToken ct = default); Task<IReadOnlyList<string>> ListRunningEmulatorsAsync(CancellationToken ct = default); }

Consumer

• MAUI DevTools CLI (maui android emulator start) — see MAUI DevTools Spec PR
• VS/VS Code extensions for emulator management

Related

• Add JDK installation support (Microsoft OpenJDK) #274 (AVD Manager wrapper)
• Add SDK bootstrap and sdkmanager wrapper #275 (ADB wrapper)
• MAUI DevTools spec §6.8: Shared Libraries & Code Reuse