Add mail categories support

Wino.Core/Requests/Category/MailCategoryCreateRequest.cs

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+using Wino.Core.Domain.Entities.Mail;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Models.Requests;
+
+namespace Wino.Core.Requests.Category;
+
+public record MailCategoryCreateRequest(MailCategory Category) : CategoryRequestBase(Category.MailAccountId)
+{
+    public override CategorySynchronizerOperation Operation => CategorySynchronizerOperation.CreateCategory;
+}

Wino.Core/Requests/Category/MailCategoryDeleteRequest.cs

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+using System.Collections.Generic;
+using Wino.Core.Domain.Entities.Mail;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Models.Requests;
+
+namespace Wino.Core.Requests.Category;
+
+public record MailCategoryDeleteRequest(
+    MailCategory Category,
+    string PreviousRemoteId,
+    IReadOnlyList<MailCategoryMessageUpdateTarget> AffectedMessages = null) : CategoryRequestBase(Category.MailAccountId)
+{
+    public override CategorySynchronizerOperation Operation => CategorySynchronizerOperation.DeleteCategory;
+}

Wino.Core/Requests/Category/MailCategoryRequestModels.cs

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+using System.Collections.Generic;
+
+namespace Wino.Core.Requests.Category;
+
+public sealed record MailCategoryMessageUpdateTarget(string MessageId, IReadOnlyList<string> CategoryNames);

Wino.Core/Requests/Category/MailCategoryUpdateRequest.cs

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+using System.Collections.Generic;
+using Wino.Core.Domain.Entities.Mail;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Models.Requests;
+
+namespace Wino.Core.Requests.Category;
+
+public record MailCategoryUpdateRequest(
+    MailCategory Category,
+    string PreviousName,
+    string PreviousRemoteId,
+    IReadOnlyList<MailCategoryMessageUpdateTarget> AffectedMessages = null) : CategoryRequestBase(Category.MailAccountId)
+{
+    public override CategorySynchronizerOperation Operation => CategorySynchronizerOperation.UpdateCategory;
+}