[LOG] More details log for key when TRITON_PRINT_AUTOTUNING=1 (#7017)

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# More details log for key when TRITON_PRINT_AUTOTUNING=1
Fix #6636

When running auto tuner with `TRITON_PRINT_AUTOTUNING=1`, we could just
see the best configuration but not **key**, some user would like to see
the **key** if there is multiple combination of **key**.

This PR tries to log more details about key.

Author: wenqiny

python/triton/runtime/autotuner.py

@@ -243,8 +243,8 @@ def benchmark():
             config = self.configs[0]
         self.best_config = config
         if knobs.autotuning.print and not used_cached_result:
-            print(f"Triton autotuning for function {self.base_fn.__name__} finished after "
-                  f"{self.bench_time:.2f}s; best config selected: {self.best_config};")
+            print(f"Triton autotuning for function {self.base_fn.__name__},\nwith key as {key},\n"
+                  f"finished after {self.bench_time:.2f}s,\nbest config selected: {self.best_config};")
         if config.pre_hook is not None:
             full_nargs = {**self.nargs, **kwargs, **config.all_kwargs()}
             config.pre_hook(full_nargs)