Add support for animation tension

[nkoenig]

Signed-off-by: Nate Koenig [email protected]

🎉 New feature

Summary

PoseAnimation was missing the tension parameter, which was implemented in gazebo classic.

I didn't put this in ign-common3 because the Animation classes were not PIMPL-ized.

Test it

See: gazebosim/gz-sim#1091

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• 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

[codecov]

Codecov Report

Merging #256 (fb1b612) into ign-common4 (2af6895) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           ign-common4     #256      +/-   ##
===============================================
+ Coverage        77.00%   77.05%   +0.04%     
===============================================
  Files               75       75              
  Lines            10655    10665      +10     
===============================================
+ Hits              8205     8218      +13     
+ Misses            2450     2447       -3     

Impacted Files	Coverage Δ
graphics/src/Animation.cc	95.73% <100.00%> (+1.70%)	⬆️

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[mjcarroll]

One though on a todo for forward porting.

Is there any integration/unit testing that we can add here?

[mjcarroll]

@osrf-jenkins retest this please

[nkoenig]

Added a test in fb1b612