Create entities for TA playlists creation and edit

Jellyfin.Plugin.TubeArchivistMetadata/TubeArchivist/Playlist/CustomPlaylistCreation.cs

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+using Newtonsoft.Json;
+
+namespace Jellyfin.Plugin.TubeArchivistMetadata.TubeArchivist
+{
+    /// <summary>
+    /// A class representing TubeArchivist API custom playlist creation request.
+    /// </summary>
+    public class CustomPlaylistCreation
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="CustomPlaylistCreation"/> class.
+        /// </summary>
+        /// <param name="playlistName">The name of the new custom playlist to create.</param>
+        public CustomPlaylistCreation(string playlistName)
+        {
+            this.PlaylistName = playlistName;
+        }
+
+        /// <summary>
+        /// Gets or sets the name of the new custom playlist to create.
+        /// </summary>
+        [JsonProperty(PropertyName = "playlist_name")]
+        public string PlaylistName { get; set; }
+    }
+}

Jellyfin.Plugin.TubeArchivistMetadata/TubeArchivist/Playlist/CustomPlaylistEntryAction.cs

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+using System.Globalization;
+using Newtonsoft.Json;
+
+namespace Jellyfin.Plugin.TubeArchivistMetadata.TubeArchivist
+{
+    /// <summary>
+    /// Enum representing the possible actions to execute on a TubeArchivist custom playlist video.
+    /// </summary>
+    public enum CustomPlaylistAction
+    {
+        /// <summary>
+        /// Create a new custom playlist video.
+        /// </summary>
+        Create,
+
+        /// <summary>
+        /// Removea custom playlist video.
+        /// </summary>
+        Remove,
+
+        /// <summary>
+        /// Move a custom playlist video to the top of the list.
+        /// </summary>
+        Top,
+
+        /// <summary>
+        /// Move a custom playlist video to the bottom of the list.
+        /// </summary>
+        Bottom,
+
+        /// <summary>
+        /// Move a custom playlist video up in the list.
+        /// </summary>
+        Up,
+
+        /// <summary>
+        /// Move a custom playlist video down in the list.
+        /// </summary>
+        Down
+    }
+
+    /// <summary>
+    /// A class representing TubeArchivist API custom playlist entry operation request.
+    /// </summary>
+    public class CustomPlaylistEntryAction
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="CustomPlaylistEntryAction"/> class.
+        /// </summary>
+        /// <param name="action">The standard action to create a new entry.</param>
+        /// <param name="videoId">The entry YoutubeId.</param>
+        public CustomPlaylistEntryAction(
+            CustomPlaylistAction action,
+            string videoId)
+        {
+            this.Action = action.ToString().ToLower(CultureInfo.CurrentCulture);
+            this.VideoId = videoId;
+        }
+
+        /// <summary>
+        /// Gets or sets the standard action to create a new entry.
+        /// </summary>
+        [JsonProperty(PropertyName = "action")]
+        public string Action { get; set; }
+
+        /// <summary>
+        /// Gets or sets the entry YoutubeId.
+        /// </summary>
+        [JsonProperty(PropertyName = "video_id")]
+        public string VideoId { get; set; }
+    }
+}