feat(sponsorblock/chapters): Add SponsorBlock chapters model

src/Lavalink4NET.Integrations.SponsorBlock/Converters/NumberTimeSpanJsonConverter.cs

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+namespace Lavalink4NET.Integrations.SponsorBlock.Converters;
+
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+public sealed class NumberTimeSpanJsonConverter : JsonConverter<TimeSpan>
+{
+    public override TimeSpan Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        return TimeSpan.FromMilliseconds(reader.GetInt64());
+    }
+
+    public override void Write(Utf8JsonWriter writer, TimeSpan value, JsonSerializerOptions options)
+    {
+        writer.WriteNumberValue((long)value.TotalMilliseconds);
+    }
+}

src/Lavalink4NET.Integrations.SponsorBlock/Converters/StringTimeSpanJsonConverter.cs

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+namespace Lavalink4NET.Integrations.SponsorBlock.Converters;
+
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+public sealed class StringTimeSpanJsonConverter : JsonConverter<TimeSpan>
+{
+    public override TimeSpan Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        return TimeSpan.FromMilliseconds(long.Parse(reader.GetString()!));
+    }
+
+    public override void Write(Utf8JsonWriter writer, TimeSpan value, JsonSerializerOptions options)
+    {
+        writer.WriteStringValue(((long)value.TotalMilliseconds).ToString());
+    }
+}

src/Lavalink4NET.Integrations.SponsorBlock/Payloads/ChapterModel.cs

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+namespace Lavalink4NET.Integrations.SponsorBlock.Payloads;
+
+using System;
+using System.Text.Json.Serialization;
+using Lavalink4NET.Integrations.SponsorBlock.Converters;
+
+public sealed record class ChapterModel(
+#if NET7_0_OR_GREATER
+    [property: JsonRequired]
+#endif
+    [property: JsonPropertyName("name")]
+    string Name,
+
+#if NET7_0_OR_GREATER
+    [property: JsonRequired]
+#endif
+    [property: JsonConverter(typeof(NumberTimeSpanJsonConverter))]
+    [property: JsonPropertyName("start")]
+    TimeSpan Start,
+
+#if NET7_0_OR_GREATER
+    [property: JsonRequired]
+#endif
+    [property: JsonConverter(typeof(NumberTimeSpanJsonConverter))]
+    [property: JsonPropertyName("end")]
+    TimeSpan End,
+
+#if NET7_0_OR_GREATER
+    [property: JsonRequired]
+#endif
+    [property: JsonConverter(typeof(NumberTimeSpanJsonConverter))]
+    [property: JsonPropertyName("duration")]
+    TimeSpan Duration);

src/Lavalink4NET.Integrations.SponsorBlock/Payloads/ChaptersLoadedEventPayload.cs

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+namespace Lavalink4NET.Integrations.SponsorBlock.Payloads;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+internal class ChaptersLoadedEventPayload
+{
+}