Pass relevant JsonWriterOptions from the KiotaJsonSerializationContext.Options to the Utf8JsonWriter when writing json to enable customization.

[andrueastman]

Related to discussion at microsoft/kiota#4898 (reply in thread)

Trying out the code below, the Encode settings seem to have no effect on the serialized payload.

        var jsonSerializationOptions = new JsonSerializerOptions
        {
            WriteIndented = true,
            Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping
        };
        var kiotaJsonSerializationContext = new KiotaJsonSerializationContext(jsonSerializationOptions); // create serialization context with custom options
        SerializationWriterFactoryRegistry.DefaultInstance.ContentTypeAssociatedFactories["application/json"] = new JsonSerializationWriterFactory(kiotaJsonSerializationContext); // replace the json serializer with one with custom options

        var requestJson = await KiotaJsonSerializer.SerializeAsStringAsync(request);

This is because, the JsonSerializationWriter initializes a Utf8JsonWriter instance without propagating relelvant options to the JsonWriterOptions parameter in the constructor here.

https://github.com/microsoft/kiota-serialization-json-dotnet/blob/046356f4e43767b12cfa7b6d223671d83e63309c/src/JsonSerializationWriter.cs#L51

The line should probably be updated to something as below and relevant tests added.

writer = new Utf8JsonWriter(_stream, new JsonWriterOptions {
    Encoder = kiotaJsonSerializationContext.Options.Encoder,
    Indented = kiotaJsonSerializationContext.Options.WriteIndented
});

[andrueastman]

Transferring issue as part of #238