Use ExampleRobotWrapper for initialization in all examples

[urfeex]

This way the examples are a lot shorter and initialization is the same everywhere, making things easier to maintain.

[codecov]

Codecov Report

Attention: Patch coverage is 38.23529% with 21 lines in your changes missing coverage. Please review.

Project coverage is 72.36%. Comparing base (b9b9fcf) to head (236a669).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/example_robot_wrapper.cpp	38.23%	13 Missing and 8 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #265      +/-   ##
==========================================
- Coverage   73.65%   72.36%   -1.29%     
==========================================
  Files          80       80              
  Lines        3059     3090      +31     
  Branches      389      397       +8     
==========================================
- Hits         2253     2236      -17     
- Misses        593      636      +43     
- Partials      213      218       +5     

Flag	Coverage Δ
ur20-latest	71.00% <35.29%> (-1.12%)	⬇️
ur5-3.14.3	71.89% <38.23%> (-0.87%)	⬇️
ur5e-5.9.4	71.70% <38.23%> (-0.70%)	⬇️

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[SarveshMalladi]

There is some codecov failures that need to be cleared