#13806 Python: Add color legend scripting API

Expose RimColorLegendCollection and RimColorLegend to Python via
CAF_PDM_OBJECT_METHOD entries that let callers create a legend, append
category items with a hex-string color, bind a legend to a (case,
resultName) pair and delete that binding.

Scriptable fields on RimColorLegend and RimColorLegendItem make the
created objects inspectable from Python.

The (case, resultName) binding interface in RimColorLegendCollection,
RimRegularLegendConfig and RimEclipseCellColors now takes a const RimCase*
instead of a case id, matching the caller patterns and avoiding ambiguity
when multiple cases share an id domain.

ApplicationLibCode/ProjectDataModel/RimRegularLegendConfig.cpp

@@ -1157,7 +1157,10 @@ int RimRegularLegendConfig::significantDigitsInData() const
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
-void RimRegularLegendConfig::setDefaultConfigForResultName( int caseId, const QString& resultName, bool useDiscreteLogLevels, bool isCategoryResult )
+void RimRegularLegendConfig::setDefaultConfigForResultName( const RimCase* rimCase,
+                                                            const QString& resultName,
+                                                            bool           useDiscreteLogLevels,
+                                                            bool           isCategoryResult )
 {
     bool useLog = RiaResultNames::isLogarithmicResult( resultName );
 
@@ -1213,7 +1216,7 @@ void RimRegularLegendConfig::setDefaultConfigForResultName( int caseId, const QS
     updateTickCountAndUserDefinedRange();
 
     RimProject* project       = RimProject::current();
-    auto        defaultLegend = project->colorLegendCollection()->findDefaultLegendForResult( caseId, resultName );
+    auto        defaultLegend = project->colorLegendCollection()->findDefaultLegendForResult( rimCase, resultName );
     if ( defaultLegend )
     {
         setColorLegend( defaultLegend );