Implement basic unit test infrastructure with abstraction patterns

Co-authored-by: ngenovese11 <23391587+ngenovese11@users.noreply.github.com>

tests/PepperDash.Essentials.Core.Tests/Abstractions/ILogger.cs

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+using System;
+
+namespace PepperDash.Essentials.Core.Tests.Abstractions
+{
+    /// <summary>
+    /// Abstraction for logging operations to enable testing
+    /// </summary>
+    public interface ILogger
+    {
+        /// <summary>
+        /// Logs a debug message
+        /// </summary>
+        /// <param name="source">Source of the log message</param>
+        /// <param name="message">Message to log</param>
+        /// <param name="args">Format arguments</param>
+        void LogDebug(object source, string message, params object[] args);
+        
+        /// <summary>
+        /// Logs a verbose message
+        /// </summary>
+        /// <param name="source">Source of the log message</param>
+        /// <param name="message">Message to log</param>
+        /// <param name="args">Format arguments</param>
+        void LogVerbose(object source, string message, params object[] args);
+    }
+}

tests/PepperDash.Essentials.Core.Tests/Abstractions/IQueue.cs

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+using System;
+
+namespace PepperDash.Essentials.Core.Tests.Abstractions
+{
+    /// <summary>
+    /// Abstraction for queue operations to enable testing
+    /// </summary>
+    /// <typeparam name="T">Type of items in the queue</typeparam>
+    public interface IQueue<T>
+    {
+        /// <summary>
+        /// Number of items in the queue
+        /// </summary>
+        int Count { get; }
+        
+        /// <summary>
+        /// Adds an item to the queue
+        /// </summary>
+        /// <param name="item">Item to add</param>
+        void Enqueue(T item);
+        
+        /// <summary>
+        /// Removes and returns the next item from the queue
+        /// </summary>
+        /// <returns>The next item, or default(T) if queue is empty</returns>
+        T Dequeue();
+    }
+}

tests/PepperDash.Essentials.Core.Tests/Abstractions/IThreadService.cs

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+using System;
+
+namespace PepperDash.Essentials.Core.Tests.Abstractions
+{
+    /// <summary>
+    /// Abstraction for thread operations to enable testing
+    /// </summary>
+    public interface IThreadService
+    {
+        /// <summary>
+        /// Sleeps the current thread for the specified milliseconds
+        /// </summary>
+        /// <param name="milliseconds">Time to sleep in milliseconds</param>
+        void Sleep(int milliseconds);
+        
+        /// <summary>
+        /// Creates and starts a new thread
+        /// </summary>
+        /// <param name="threadFunction">The function to execute in the thread</param>
+        /// <param name="parameter">Parameter to pass to the thread function</param>
+        /// <returns>Thread identifier or handle</returns>
+        object CreateAndStartThread(Func<object, object> threadFunction, object parameter);
+        
+        /// <summary>
+        /// Aborts the specified thread
+        /// </summary>
+        /// <param name="thread">The thread to abort</param>
+        void AbortThread(object thread);
+        
+        /// <summary>
+        /// Checks if the thread is currently running
+        /// </summary>
+        /// <param name="thread">The thread to check</param>
+        /// <returns>True if the thread is running, false otherwise</returns>
+        bool IsThreadRunning(object thread);
+    }
+}