Add R^dxd handling in BuiltinFunctionEmbedder

src/language/ast/ASTNodeBuiltinFunctionExpressionBuilder.cpp

src/language/node_processor/FunctionArgumentConverter.hpp

src/language/utils/PugsFunctionAdapter.hpp

tests/test_ASTNodeBuiltinFunctionExpressionBuilder.cpp

tests/test_BuiltinFunctionEmbedder.cpp

tests/test_BuiltinFunctionRegister.hpp

tests/test_PugsFunctionAdapter.cpp