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mxtensor: make scale shape match qdata #3198
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  vkuzo 
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Summary: Given `qdata` shape M, K, makes `scale` shape be M, K // block_size This will be important to keep the logic sane as we add pre-swizzling in a future PR. Test Plan: ``` pytest test/prototype/mx_formats/ -s -x ``` Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: d8d4e78 ghstack-comment-id: 3413479441 Pull-Request: #3198
| 🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/3198
 Note: Links to docs will display an error until the docs builds have been completed. This comment was automatically generated by Dr. CI and updates every 15 minutes. | 
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Summary: Given `qdata` shape M, K, makes `scale` shape be M, K // block_size This will be important to keep the logic sane as we add pre-swizzling in a future PR. Test Plan: ``` pytest test/prototype/mx_formats/ -s -x ``` Reviewers: Subscribers: Tasks: Tags: ghstack-source-id: 4d07c2b ghstack-comment-id: 3413479441 Pull-Request: #3198
              
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Summary:
Given
qdatashape M, K, makesscaleshape be M, K // block_sizeThis will be important to keep the logic sane as we add pre-swizzling
in a future PR.
Test Plan:
Reviewers:
Subscribers:
Tasks:
Tags: