[CHANGE] WIP YouTubeClient & HTML parsing

Manager.YouTube/Models/Innertube/ClientState.cs

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+using System.Text.Json.Serialization;
+
+namespace Manager.YouTube.Models.Innertube;
+
+public class ClientState
+{
+    [JsonExtensionData]
+    public Dictionary<string, object> AdditionalData { get; set; } = [];
+
+    [JsonPropertyName("INNERTUBE_API_KEY")]
+    public string? InnertubeApiKey { get; set; }
+    
+    [JsonPropertyName("SIGNIN_URL")]
+    public string? SigninUrl { get; set; }
+
+    [JsonPropertyName("SBOX_SETTINGS")]
+    public SBoxSettings? SBoxSettings { get; set; }
+}

Manager.YouTube/Models/Innertube/SBoxSettings.cs

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+using System.Text.Json.Serialization;
+
+namespace Manager.YouTube.Models.Innertube;
+
+public class SBoxSettings
+{
+    [JsonExtensionData]
+    public Dictionary<string, object> AdditionalData { get; set; } = [];
+
+    [JsonPropertyName("VISITOR_DATA")]
+    public string? VisitorData { get; set; }
+}