Use await instead of hand-written continuation.

The compiler-generated state machine reduces allocations and performs better in benchmarks.

Author: bgrainger

src/MySqlConnector/ValueTaskExtensions.cs

@@ -1,15 +1,11 @@
-using System;
+using System;
 using System.Threading.Tasks;
 
 namespace MySql.Data
 {
 	internal static class ValueTaskExtensions
 	{
-		public static ValueTask<TResult> ContinueWith<T, TResult>(this ValueTask<T> valueTask, Func<T, ValueTask<TResult>> continuation)
-		{
-			return valueTask.IsCompleted ? continuation(valueTask.Result) :
-				new ValueTask<TResult>(valueTask.AsTask().ContinueWith(task => continuation(task.GetAwaiter().GetResult()).AsTask()).Unwrap());
-		}
+		public static async ValueTask<TResult> ContinueWith<T, TResult>(this ValueTask<T> valueTask, Func<T, ValueTask<TResult>> continuation) => await continuation(await valueTask);
 
 		public static ValueTask<T> FromException<T>(Exception exception) => new ValueTask<T>(Utility.TaskFromException<T>(exception));
 	}