MoveItConfigBuilder support for multiple instaces

[MarcoMagriDev]

Creating two instances of MoveItConfigBuilder seems to be unsupported due to conflicting MoveItConfigs.
This is an example launcher to reproduce the issue test_builder.zip.
As you can notice by running the script (with the current version of the MoveItConfigBuilder) the attributes of two different MoveItConfigs (produced by two different MoveItConfigBuilder) share the same id and values (the one of the fanuc in the provided example).

The proposed solution simply consists in moving the instatiation of the MoveItConfigs inside the __init__() method of MoveItConfigBuilder. By doing so the problem seems to be solved (running again the script after applying the modification result in the expected behavior).

[JafarAbdi]

Thanks!

[codecov]

Codecov Report

Base: 50.27% // Head: 50.27% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (caf12b1) compared to base (e60bced).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1807      +/-   ##
==========================================
+ Coverage   50.27%   50.27%   +0.01%     
==========================================
  Files         374      374              
  Lines       31286    31286              
==========================================
+ Hits        15726    15727       +1     
+ Misses      15560    15559       -1     

Impacted Files	Coverage Δ
...dl_kinematics_plugin/src/kdl_kinematics_plugin.cpp	78.79% <0.00%> (-1.13%)	⬇️
...nning_scene_monitor/src/planning_scene_monitor.cpp	45.69% <0.00%> (+0.44%)	⬆️

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