Add tests for function templates of declare_parameter (#1747)
Add tests for function templates of declare_parameter (#1747)

* Add function template tests for all defined types of declare_parameter

Signed-off-by: Nico Neumann <cf07925562337aee5e28af1b70ba09d3ca9301b0@iosb.fraunhofer.de>
ros2/rclcpp,ros2/rclcpp