Missing RAM parameter in StereoRectificationGridGenerator application

Summary

StereoRectificationGridGenerator application tries to use the -ram parameter which is not a parameter of the application:

https://gitlab.orfeo-toolbox.org/orfeotoolbox/otb/blob/develop/Modules/Applications/AppStereo/app/otbStereoRectificationGridGenerator.cxx#L306

This MR adds the RAM parameter and add a test to check the mode of the application using it.

Copyright

The copyright owner is CNES and has signed the ORFEO ToolBox Contributor License Agreement.

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Modules/Applications/AppStereo/app/otbStereoRectificationGridGenerator.cxx

@@ -253,6 +253,8 @@ private:
     SetDefaultParameterInt("inverse.ssrate", 16);
     SetMinimumParameterIntValue("inverse.ssrate", 1);
 
+    AddRAMParameter();
+
     // Doc example
     SetDocExampleParameterValue("io.inleft", "wv2_xs_left.tif");
     SetDocExampleParameterValue("io.inright", "wv2_xs_left.tif");