Fault distance from point (#13367)

* Add python interface for distance to closest fault
* Split up some older code into multiple files.
* Add python test

GrpcInterface/RiaGrpcHelper.h

@@ -19,6 +19,7 @@
 
 #include "Definitions.grpc.pb.h"
 
+#include "cvfStructGrid.h"
 #include "cvfVector3.h"
 
 #include <QString>
@@ -51,4 +52,6 @@ public:
 
     static size_t   numberOfDataUnitsInPackage( size_t dataUnitSize, size_t packageByteCount = 64 * 1024u );
     static RimCase* findCase( int caseId );
+
+    static std::string faceTypeToString( cvf::StructGridInterface::FaceType );
 };