message: Add leaky_relu operator property
diff: @@ -792,6 +792,7 @@ OperatorProperty GetOperatorProperty(const ModelT* model, int subgraph_index,
  property.outputs = {{0, {}}};
  property.version = 2;
  break;
  + case BuiltinOperator_LEAKY_RELU:
  case BuiltinOperator_RELU:
  case BuiltinOperator_RELU6:
  property.inputs = {{0, {}}};
  