Added GILReleaser to pick & place methods

[gerardcanal]

Description

Added the GILReleaser Pattern to the pick and place operations to prevent thread blocking when those methods were called in python.

This should be merged after #2231 (as it includes the releaser in the methods added there).

Tested in melodic, it would be good to have it ported there too.

@v4hn and @gleichdick may be good candidates for review.

Checklist

• Required by CI: Code is auto formatted using clang-format
• Extend the tutorials / documentation reference
• Document API changes relevant to the user in the MIGRATION.md notes
• Create tests, which fail without this PR reference
• Include a screenshot if changing a GUI
• While waiting for someone to review your request, please help review another open pull request to support the maintainers

[v4hn]

@gerardcanal now you just have to rebase this one more time :-)

[codecov]

Codecov Report

Merging #2272 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2272      +/-   ##
==========================================
+ Coverage   57.86%   57.92%   +0.05%     
==========================================
  Files         326      326              
  Lines       25643    25643              
==========================================
+ Hits        14839    14853      +14     
+ Misses      10804    10790      -14     

Impacted Files	Coverage Δ
...ove_group_interface/src/wrap_python_move_group.cpp	41.74% <ø> (ø)
...raint_samplers/src/default_constraint_samplers.cpp	84.36% <0.00%> (+0.36%)	⬆️
...meterization/work_space/pose_model_state_space.cpp	82.99% <0.00%> (+0.68%)	⬆️
...ipulation/pick_place/src/manipulation_pipeline.cpp	77.35% <0.00%> (+0.94%)	⬆️
...nning_scene_monitor/src/planning_scene_monitor.cpp	71.53% <0.00%> (+1.63%)	⬆️

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[gerardcanal]

@gerardcanal now you just have to rebase this one more time :-)

Rebased! :-D

[v4hn]

Thanks again for your contributions @gerardcanal !

[v4hn]

@gerardcanal If you want to see these patches in melodic-devel right way, feel free to create a backport pull-request.
Otherwise they will be backported with the next batch of things between reviewed-for-backport and master

[gerardcanal]

Thank you, @v4hn. I created the backport PR :-)