Impove UX general setting by added helpers dialogs for user (#42)

- Added dialogs for selecting url, model and custom model when provider doesn't provide model list or setup of qode assist is not finishing

providers/LMStudioProvider.hpp

@@ -32,6 +32,7 @@ public:
     QString url() const override;
     QString completionEndpoint() const override;
     QString chatEndpoint() const override;
+    bool supportsModelListing() const override;
     void prepareRequest(QJsonObject &request, LLMCore::RequestType type) override;
     bool handleResponse(QNetworkReply *reply, QString &accumulatedResponse) override;
     QList<QString> getInstalledModels(const QString &url) override;