Add first-class support for Grok unique features

[kzu]

• Live search support: On/Off/Auto setting
• Reasoning effort: for grok-3-mini

Example:

var messages = new Chat()
{
    { "system", "You are a highly intelligent AI assistant." },
    { "user", "What is 101*3?" },
};

var grok = new GrokClient(Env.Get("XAI_API_KEY")!);

var options = new GrokChatOptions
{
    ModelId = "grok-3-mini", // or "grok-3-mini-fast"
    Temperature = 0.7f,
    ReasoningEffort = ReasoningEffort.High, // or Low
    Search = GrokSearch.Auto, // or GrokSearch.On or GrokSearch.Off
};

var response = await grok.GetResponseAsync(messages, options);

AnsiConsole.MarkupLine($":robot: {response.Text}");

[kzu]

🧪 Details on Ubuntu 24.04.2 LTS

from dotnet-retest v0.7.1 on .NET 8.0.17 with 💜 by @devlooped