Implement Similarity providers

MediaBrowser.Controller/Library/SimilarItemsQuery.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using Jellyfin.Database.Implementations.Entities;
+using MediaBrowser.Controller.Dto;
+
+namespace MediaBrowser.Controller.Library;
+
+/// <summary>
+/// Query options for similar items requests.
+/// </summary>
+public class SimilarItemsQuery
+{
+    /// <summary>
+    /// Gets or sets the user context.
+    /// </summary>
+    public User? User { get; set; }
+
+    /// <summary>
+    /// Gets or sets the maximum number of results.
+    /// </summary>
+    public int? Limit { get; set; }
+
+    /// <summary>
+    /// Gets or sets the DTO options.
+    /// </summary>
+    public DtoOptions? DtoOptions { get; set; }
+
+    /// <summary>
+    /// Gets or sets the item IDs to exclude from results.
+    /// </summary>
+    public IReadOnlyList<Guid> ExcludeItemIds { get; set; } = [];
+
+    /// <summary>
+    /// Gets or sets the artist IDs to exclude from results.
+    /// </summary>
+    public IReadOnlyList<Guid> ExcludeArtistIds { get; set; } = [];
+}