Add service for configuring view control sensitivity

[iche033]

🎉 New feature

Closes gazebosim/gz-sim#1027

Related PR: gazebosim/gz-sim#1799

Summary

Exposes a service for controlling how sensitive the camera view control movements are. Default is 1.0. The higher the number the more sensitive camera view control is to mouse movements. Affects all camera movements - pan, orbit, zoom.

Note that I also updated the camera reference visual service name to include the view_control string to be consistent with other service names.

Test it

Use the spin box added in gazebosim/gz-sim#1799 to change the sensitivity settings and see the effect on camera movements.

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Consider updating Python bindings (if the library has them)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov]

Codecov Report

Merging #504 (c3c8b81) into ign-gui6 (cdbd53c) will decrease coverage by 0.60%.
The diff coverage is 22.00%.

@@             Coverage Diff              @@
##           ign-gui6     #504      +/-   ##
============================================
- Coverage     67.46%   66.85%   -0.61%     
============================================
  Files            39       39              
  Lines          5286     5310      +24     
============================================
- Hits           3566     3550      -16     
- Misses         1720     1760      +40     

Impacted Files	Coverage Δ
src/plugins/minimal_scene/MinimalScene.cc	60.00% <15.38%> (-4.65%)	⬇️
...interactive_view_control/InteractiveViewControl.cc	18.04% <24.32%> (+2.15%)	⬆️
src/plugins/scene3d/Scene3D.cc	49.87% <0.00%> (+0.25%)	⬆️

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[jennuine]

Works well, left a minor nit on dox