[Config][Disaggregated] Add timeout configuration for the torch.store and add KVTransferConfig.kv_connector_extra_config (#14367)

Signed-off-by: Mathis Felardos <mathis@mistral.ai>

vllm/config.py

@@ -2837,6 +2837,9 @@ class KVTransferConfig(BaseModel):
     # The KV connector port, used to build distributed connection
     kv_port: int = 14579
 
+    # any extra config that the connector may need
+    kv_connector_extra_config: dict[str, Any] = {}
+
     def compute_hash(self) -> str:
         """
         WARNING: Whenever a new field is added to this config,
@@ -2896,6 +2899,9 @@ class KVTransferConfig(BaseModel):
         return self.kv_connector is not None and \
             self.kv_role in ["kv_consumer", "kv_both"]
 
+    def get_from_extra_config(self, key, default) -> Any:
+        return self.kv_connector_extra_config.get(key, default)
+
 
 class CompilationLevel:
     # constants for the levels of the compilation process