[Kernel] GLM5 Router GEMM

[jeejeelee]

Purpose

Borrrow idea from NVIDIA/TensorRT-LLM#13740

Test Plan

Test Result

GSM8K

• main branch

local-completions ({'model': 'zai-org/GLM-5.2-FP8', 'base_url': 'http://0.0.0.0:8000/v1/completions', 'tokenized_requests': False, 'tokenizer_backend': None, 'num_concurrent': 256}), gen_kwargs: ({}), limit: None, num_fewshot: 5, batch_size: 1
|Tasks|Version|     Filter     |n-shot|  Metric   |   |Value |   |Stderr|
|-----|------:|----------------|-----:|-----------|---|-----:|---|-----:|
|gsm8k|      3|flexible-extract|     5|exact_match|↑  |0.9454|±  |0.0063|
|     |       |strict-match    |     5|exact_match|↑  |0.9454|±  |0.0063|

• this PR

local-completions ({'model': 'zai-org/GLM-5.2-FP8', 'base_url': 'http://0.0.0.0:8000/v1/completions', 'tokenized_requests': False, 'tokenizer_backend': None, 'num_concurrent': 256}), gen_kwargs: ({}), limit: None, num_fewshot: 5, batch_size: 1
|Tasks|Version|     Filter     |n-shot|  Metric   |   |Value |   |Stderr|
|-----|------:|----------------|-----:|-----------|---|-----:|---|-----:|
|gsm8k|      3|flexible-extract|     5|exact_match|↑  |0.9424|±  |0.0064|
|     |       |strict-match    |     5|exact_match|↑  |0.9431|±  |0.0064|

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Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.