[RUNTIME] Major code cleanup (#711)

This PR does the following:
- CUDA utilities (e.g., cuGetInfo) won't be compiled as part of libtriton.so anymore.
- Refactoring driver/llvm.cc to split it between PTX codegen and python.
- By extension this will also deprecate include/external so Triton won't have to live with a copy of some CUDA/Hip headers anymore.
- `triton-translate` becomes a `triton.tools.aot` Python utility that re-uses functions from the triton.compile sub-module.

CMakeLists.txt

@@ -184,7 +184,6 @@ target_link_libraries(triton
   TritonAnalysis
   TritonTransforms
   TritonGPUTransforms
-  TritonDriver
   TritonLLVMIR
   TritonPTX
   ${dialect_libs}