[MetaSchedule] Added a cost model (#11961)

In this PR, I added a cost model based on SegmentSum MLP, which can be used for pre-training or integration with TVM.

Author: Kathryn-cat

python/tvm/meta_schedule/cost_model/cost_model.py

@@ -190,7 +190,7 @@ def update(
         raise NotImplementedError
 
     def predict(self, context: TuneContext, candidates: List[MeasureCandidate]) -> np.ndarray:
-        """Update the cost model given running results.
+        """Predict given the measure candidates.
 
         Parameters
         ----------