Add ModelContextProtocol.Core package (#428)

src/ModelContextProtocol/SemaphoreSlimExtensions.cs

@@ -1,40 +0,0 @@
-namespace ModelContextProtocol;
-
-internal static class SynchronizationExtensions
-{
-    /// <summary>
-    /// Asynchronously acquires a lock on the semaphore and returns a disposable object that releases the lock when disposed.
-    /// </summary>
-    /// <param name="semaphore">The semaphore to acquire a lock on.</param>
-    /// <param name="cancellationToken">A cancellation token to observe while waiting for the semaphore.</param>
-    /// <returns>A disposable <see cref="Releaser"/> that releases the semaphore when disposed.</returns>
-    /// <remarks>
-    /// This extension method provides a convenient pattern for using a semaphore in asynchronous code,
-    /// similar to how the `lock` statement is used in synchronous code.
-    /// </remarks>
-    /// <exception cref="OperationCanceledException">The <paramref name="cancellationToken"/> was canceled.</exception>
-    public static async ValueTask<Releaser> LockAsync(this SemaphoreSlim semaphore, CancellationToken cancellationToken = default)
-    {
-        await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
-        return new(semaphore);
-    }
-
-    /// <summary>
-    /// A disposable struct that releases a semaphore when disposed.
-    /// </summary>
-    /// <remarks>
-    /// This struct is used with the <see cref="LockAsync"/> extension method to provide
-    /// a using-pattern for semaphore locking, similar to lock statements.
-    /// </remarks>
-    public readonly struct Releaser(SemaphoreSlim semaphore) : IDisposable
-    {
-        /// <summary>
-        /// Releases the semaphore.
-        /// </summary>
-        /// <remarks>
-        /// This method is called automatically when the <see cref="Releaser"/> goes out of scope
-        /// in a using statement or expression.
-        /// </remarks>
-        public void Dispose() => semaphore.Release();
-    }
-}