Added tool calling support (#731)

Co-authored-by: krut_ni <nils.kruthoff@dlr.de>
Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Provider/OpenAI/ChatCompletionResponseMessage.cs

@@ -0,0 +1,19 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace AIStudio.Provider.OpenAI;
+
+public sealed record ChatCompletionResponseMessage
+{
+    public string Role { get; init; } = string.Empty;
+
+    [JsonPropertyName("content")]
+    public JsonElement? RawContent { get; init; }
+
+    [JsonIgnore]
+    public string? Content => ChatCompletionContent.GetText(this.RawContent);
+
+    public string? ReasoningContent { get; init; }
+
+    public IList<ChatCompletionToolCall?>? ToolCalls { get; init; }
+}