Add LogToSink extensions for assign the implementation of ILogSink to Logger

[rstm-sf]

Hello!

Maybe add LogToSink extensions for assign the implementation of ILogSink to Logger?

Logging Errors and Warnings / Removing Serilog

/// <summary>
/// Logs Avalonia events to the <see cref="Avalonia.Logging.ILogSink"/> implementation.
/// </summary>
/// <typeparam name="T">The application class type.</typeparam>
/// <param name="builder">The app builder instance.</param>
/// <param name="logSink">The <see cref="Avalonia.Logging.ILogSink"/> implementation.</param>
/// <exception cref="ArgumentNullException">Thrown when <paramref name="logSink"/> is null.</exception>
/// <returns>The app builder instance.</returns>
public static T LogToSink<T>(this T builder, ILogSink logSink)
    where T : AppBuilderBase<T>, new()
{
    Logger.Sink = logSink ?? throw new ArgumentNullException(nameof(logSink));
    return builder;
}

[maxkatz6]

I believe "LogToSink" should be cleaner name for the method.