IDLE implementation, imap synchronization strategies basics and condstore synchronization.

Wino.Core/Synchronizers/ImapSync/UidBasedSynchronizer.cs

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+using System;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using MailKit.Net.Imap;
+using Wino.Core.Domain.Entities.Mail;
+using Wino.Core.Domain.Interfaces;
+using Wino.Core.Integration;
+
+namespace Wino.Core.Synchronizers.ImapSync
+{
+    /// <summary>
+    /// Uid based IMAP Synchronization strategy.
+    /// </summary>
+    internal class UidBasedSynchronizer : IImapSynchronizerStrategy
+    {
+        public Task<List<string>> HandleSynchronizationAsync(IImapClient client, MailItemFolder folder, IImapSynchronizer synchronizer, CancellationToken cancellationToken = default)
+        {
+            if (client is not WinoImapClient winoClient)
+                throw new ArgumentException("Client must be of type WinoImapClient.", nameof(client));
+
+            return Task.FromResult(new List<string>());
+        }
+    }
+}