Upgrade RestSharp from 106.11.4 to 113.1.0

[Copilot]

RestSharp 106.11.4 has known security vulnerabilities and uses deprecated patterns. Upgraded to 113.1.0, which requires .NET Framework 4.7.1+ and introduces breaking API changes.

Breaking Changes Addressed

Serialization/Deserialization

• Implemented ISerializer and IDeserializer interfaces (replaced IXmlDeserializer)
• Created PrestaSharpSerializer combining both interfaces for XML handling
• Removed SerializeAsAttribute usage (no longer available)

API Surface Changes

• IRestResponse → RestResponse
• IRestRequest → RestRequest
• ExecuteTaskAsync() → ExecuteAsync()
• AddParameter(..., ParameterType.RequestBody) → AddStringBody()
• AddParameter(..., ParameterType.QueryString) → AddQueryParameter()
• Method.POST/PUT/DELETE → Method.Post/Put/Delete

Client Configuration

// Before (106.x)
var client = new RestClient { BaseUrl = new Uri(BaseUrl) };
client.AddHandler("text/xml", () => new PrestaSharpDeserializer());

// After (113.x)
var options = new RestClientOptions(BaseUrl);
var serializer = new PrestaSharpSerializer();
var client = new RestClient(options, 
    configureSerialization: s => s.UseSerializer(() => serializer));

Extension Methods
Created custom extensions in Bukimedia.PrestaSharp.Helpers namespace:

• StringExtensions: AsNamespaced(), ToCamelCase(), RemoveUnderscoresAndDashes()
• ReflectionExtensions: GetAttribute<T>()

RestSharp 113 provides IsSubclassOfRawGeneric() and FindEnumValue() in its own RestSharp.Extensions namespace, so these were not duplicated.

Target Framework

Updated from net452 to net471 (minimum required by RestSharp 113).

Original prompt

Questo progetto è basato su una versione obsoleta di RestSharp. Aggiorna all'ultima versione la libreria e adatta il codice ai cambiamenti che sono avvenuti

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