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

settings/SettingsDialog.hpp

@@ -0,0 +1,50 @@
+/* 
+ * Copyright (C) 2024 Petr Mironychev
+ *
+ * This file is part of QodeAssist.
+ *
+ * QodeAssist is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * QodeAssist is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with QodeAssist. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <QComboBox>
+#include <QDialog>
+#include <QLabel>
+#include <QLayout>
+#include <QLineEdit>
+#include <QWidget>
+
+#include <coreplugin/icore.h>
+
+namespace QodeAssist::Settings {
+
+class SettingsDialog : public QDialog
+{
+public:
+    explicit SettingsDialog(const QString &title, QWidget *parent = Core::ICore::dialogParent());
+
+    QLabel *addLabel(const QString &text);
+    QLineEdit *addInputField(const QString &labelText, const QString &value);
+    void addSpacing(int space = 12);
+    QHBoxLayout *buttonLayout();
+    QVBoxLayout *mainLayout() const;
+
+    QComboBox *addComboBox(
+        const QStringList &items, const QString &currentText = QString(), bool editable = true);
+
+private:
+    QVBoxLayout *m_mainLayout;
+    QHBoxLayout *m_buttonLayout;
+};
+
+} // namespace QodeAssist::Settings