[Feature] Add Muse Glimmer model support (#34262)

Co-authored-by: sglang-bot <232288953+sglang-bot@users.noreply.github.com>
Co-authored-by: Brayden Zhong <brayden.zhong@radixark.ai>
Co-authored-by: Jimmy Shong <69131491+Jiminator@users.noreply.github.com>
Co-authored-by: hnyls2002 <lsyincs@gmail.com>
Co-authored-by: Alex Nails <alex.nails@radixark.ai>
Co-authored-by: Liangsheng Yin <hnyls2002@gmail.com>

test/registered/unit/layers/quantization/test_fp4_kv_cache_quant_method.py

@@ -75,7 +75,7 @@ class TestKVCacheQuantRegistry(CustomTestCase):
         from sglang.srt.runtime_context import get_context
 
         runner = object.__new__(ModelRunner)
-        runner.server_args = SimpleNamespace()
+        runner.server_args = SimpleNamespace(speculative_draft_kv_cache_dtype=None)
         runner.draft_attention_backend = None
         # The runner reads the requested dtype off the model bag, so the double
         # publishes it rather than carrying it on a stand-in config.