Add thread dependency to examples (Rolling)

[Acuadros95]

Related to #235

[sloretz]

Need to call find_package(Threads), but otherwise this PR seem to be adding the dependency in the correct place.

rclc/rclc_examples/src/example_action_server.c

Line 18 in 5ea1a2a

#include <pthread.h>

[codecov-commenter]

Codecov Report

Merging #237 (196d0f9) into master (5ea1a2a) will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #237      +/-   ##
==========================================
- Coverage   63.51%   63.42%   -0.10%     
==========================================
  Files          16       16              
  Lines        2149     2149              
  Branches      641      641              
==========================================
- Hits         1365     1363       -2     
- Misses        471      472       +1     
- Partials      313      314       +1     

Impacted Files	Coverage Δ
rclc/src/rclc/action_goal_handle.c	59.87% <0.00%> (-1.28%)	⬇️

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[JanStaschulat]

@sloretz @pablogs9 Thanks a lot for your valuable feedback. @Acuadros95 thanks you for taking action.

The dependency configuration of the rclc_examples package is now updated accordingly:

find_package(Threads REQUIRED)
target_link_libraries(example_action_server Threads::Threads)

in rclc_examples\CMakeLists.txt without changing other packages of the rclc-repository.
Additionally, I had to resolve some uncrustify and cpplint erros.

Are you both okay with these changes? If yes, I would like to ask you to review and approve this PR. I will then create a new bloom-release for Rolling.

[pablogs9]

LGTM