[Hybrid] Added supports_mamba_prefix_caching Protocol (#27339)

Signed-off-by: asafg <39553475+Josephasafg@users.noreply.github.com>

vllm/config/model.py

@@ -1656,6 +1656,10 @@ class ModelConfig:
     def has_inner_state(self):
         return self._model_info.has_inner_state
 
+    @property
+    def supports_mamba_prefix_caching(self) -> bool:
+        return self._model_info.supports_mamba_prefix_caching
+
     @property
     def use_mla(self) -> bool:
         return self.is_deepseek_mla and not envs.VLLM_MLA_DISABLE