public AbstractClientOptionsBuilder rpcDecorator(DecoratingRpcClientFunction decorator) {
        decoration.addRpc(decorator);
        return this;
    }
Adds the specified RPC-level {@code decorator}.

@param decorator the {@link DecoratingRpcClientFunction} that intercepts an invocation
core/src/main/java/com/linecorp/armeria/client/AbstractClientOptionsBuilder.java