Add empty set_atomically parameter service

[Acuadros95]

New parameter client implementations check the availability of all the related services before executing a command. We were missing the /set_parameters_atomically, making ROS 2 Cli parameter commands fail.

This PR adds a empty service implementation to fix this issue. Related: https://github.com/micro-ROS/micro-ROS-Agent/issues/195

Note: This fix shall be included on the Iron release.

[codecov-commenter]

Codecov Report

Merging #354 (72621aa) into master (2648503) will increase coverage by 0.42%. The diff coverage is 95.55%.

@@            Coverage Diff             @@
##           master     #354      +/-   ##
==========================================
+ Coverage   69.20%   69.63%   +0.42%     
==========================================
  Files          16       16              
  Lines        2715     2760      +45     
  Branches      765      766       +1     
==========================================
+ Hits         1879     1922      +43     
- Misses        450      452       +2     
  Partials      386      386              

Impacted Files	Coverage Δ
...lc_parameter/src/rclc_parameter/parameter_server.c	83.10% <95.55%> (+0.68%)	:arrow_up:

[rosterloh]

If it's at all helpful I've checkout out and built this branch and it fixes the ros2cli issues for me.

[JanStaschulat]

@mergifyio backport rolling iron

[mergify[bot]]

backport rolling iron

✅ Backports have been created

* [#357 Add empty set_atomically parameter service (backport #354)](https://github.com/ros2/rclc/pull/357) has been created for branch `rolling` * [#358 Add empty set_atomically parameter service (backport #354)](https://github.com/ros2/rclc/pull/358) has been created for branch `iron`

[JanStaschulat]

@Acuadros95 I added a backport for rolling and iron distribution. Do you want/need this fix on Humble and Foxy distribution as well?

[Acuadros95]

@JanStaschulat No, this is just needed on Iron and Rolling. Thanks!