Make various updates and fixes:

- Add support for legacy CUDA versions; now compatible with CUDA 12.3 and newer
- Add support for NVRTC compilation
- Other fixes and code refactoring

csrc/utils/exception.hpp

@@ -35,6 +35,16 @@ do { \
 #define DG_HOST_UNREACHABLE(reason) (throw DGException("Assertion", __FILE__, __LINE__, reason))
 #endif
 
+#ifndef DG_NVRTC_CHECK
+#define DG_NVRTC_CHECK(cmd) \
+do { \
+    const auto& e = (cmd); \
+    if (e != NVRTC_SUCCESS) { \
+        throw DGException("NVRTC", __FILE__, __LINE__, nvrtcGetErrorString(e)); \
+    } \
+} while (0)
+#endif
+
 #ifndef DG_CUDA_DRIVER_CHECK
 #define DG_CUDA_DRIVER_CHECK(cmd) \
 do { \