Add property to make pruning optional

[JafarAbdi]

Fix: https://github.com/ros-planning/moveit_task_constructor/issues/256

[codecov[bot]]

Codecov Report

Merging #358 (6b223e7) into master (8beb0f4) will increase coverage by 1.89%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #358      +/-   ##
==========================================
+ Coverage   54.57%   56.46%   +1.89%     
==========================================
  Files         102      102              
  Lines        7840     8313     +473     
==========================================
+ Hits         4278     4693     +415     
- Misses       3562     3620      +58     

Impacted Files	Coverage Δ
core/include/moveit/task_constructor/task.h	33.34% <ø> (ø)
core/include/moveit/task_constructor/stage.h	89.59% <100.00%> (+0.46%)	:arrow_up:
core/src/container.cpp	76.13% <100.00%> (+1.89%)	:arrow_up:
core/src/stage.cpp	83.31% <100.00%> (+0.38%)	:arrow_up:
core/src/task.cpp	78.78% <100.00%> (+0.12%)	:arrow_up:
core/src/solvers/cartesian_path.cpp	83.34% <0.00%> (-0.45%)	:arrow_down:
core/src/merge.cpp	66.32% <0.00%> (-0.35%)	:arrow_down:
core/src/solvers/planner_interface.cpp	100.00% <0.00%> (ø)
core/include/moveit/task_constructor/storage.h	90.48% <0.00%> (+0.79%)	:arrow_up:
... and 4 more

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