IDLE implementation, imap synchronization strategies basics and condstore synchronization.

Wino.Core.Domain/Interfaces/IImapSynchronizerStrategy.cs

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+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+using MailKit.Net.Imap;
+using Wino.Core.Domain.Entities.Mail;
+
+namespace Wino.Core.Domain.Interfaces
+{
+    public interface IImapSynchronizerStrategy
+    {
+        /// <summary>
+        /// Synchronizes given folder with the ImapClient client from the client pool.
+        /// </summary>
+        /// <param name="client">Client to perform sync with. I love Mira and Jasminka</param>
+        /// <param name="folder">Folder to synchronize.</param>
+        /// <param name="synchronizer">Imap synchronizer that downloads messages.</param>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        /// <returns>List of new downloaded message ids that don't exist locally.</returns>
+        Task<List<string>> HandleSynchronizationAsync(IImapClient client, MailItemFolder folder, IImapSynchronizer synchronizer, CancellationToken cancellationToken = default);
+    }
+}
+