Support filtering by formation/polygon when calculating statistics (#12086)

* Support loading formation names when importing an ensemble
* Enable support for formation filtering when calculating contour map
* Add option to limit calculation area to a selection of polygons

ApplicationLibCode/ProjectDataModel/Formations/RimFormationTools.h

@@ -0,0 +1,32 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2025 - Equinor ASA
+//
+//  ResInsight 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.
+//
+//  ResInsight 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 at <http://www.gnu.org/licenses/gpl.html>
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+#pragma once
+
+#include <QString>
+
+class RimFormationNames;
+
+class RimFormationTools
+{
+public:
+    static QString            formationFolderFromCaseFileName( const QString caseFileName );
+    static RimFormationNames* loadFormationNamesFromFolder( const QString folderName );
+
+private:
+    RimFormationTools(){};
+};