Refactor: Rename RiaStatisticsTools to RigStatisticsTools

Replaced all references to RiaStatisticsTools with RigStatisticsTools across the codebase, including header includes, static method calls, and test files. Updated CMake configuration to remove RiaStatisticsTools and add RigStatisticsTools. Renamed and updated related unit tests. No changes to logic or algorithms; this is a namespace and organizational refactor for consistency. Also added ApplicationLibCode include directories as PRIVATE to relevant targets.

ApplicationLibCode/ProjectDataModel/CorrelationPlots/RimCorrelationMatrixPlot.cpp

@@ -21,7 +21,7 @@
 #include "RiaColorTools.h"
 #include "RiaPreferences.h"
 #include "RiaQDateTimeTools.h"
-#include "RiaStatisticsTools.h"
+#include "RigStatisticsTools.h"
 #include "Summary/RiaSummaryCurveDefinition.h"
 
 #include "RifCsvDataTableFormatter.h"
@@ -560,7 +560,7 @@ void RimCorrelationMatrixPlot::createMatrix()
 
                     if ( parameterValues.empty() ) continue;
 
-                    correlation = RiaStatisticsTools::pearsonCorrelation( parameterValues, caseValuesAtTimestep );
+                    correlation = RigStatisticsTools::pearsonCorrelation( parameterValues, caseValuesAtTimestep );
 
                     bool validResult = RiaCurveDataTools::isValidValue( correlation, false );
                     if ( validResult )