python bindings: get/set velocity

[aclegg3]

Motivation and Context

This PR completes #565 with modified python testing.

How Has This Been Tested

New test statements in tests/test_physics.py.

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have completed my CLA (see CONTRIBUTING)
• I have added tests to cover my changes.
• All new and existing tests passed.

[jturner65]

Looks good.

[codecov]

Codecov Report

Merging #591 into master will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #591      +/-   ##
==========================================
+ Coverage   56.50%   56.56%   +0.06%     
==========================================
  Files         128      128              
  Lines        5612     5620       +8     
  Branches       84       84              
==========================================
+ Hits         3171     3179       +8     
  Misses       2441     2441              

Flag	Coverage Δ
#CPP	52.03% <ø> (ø)
#JavaScript	10.00% <ø> (ø)
#Python	75.64% <100.00%> (+0.09%)	⬆️

Impacted Files	Coverage Δ
src/esp/sim/Simulator.h	100.00% <ø> (ø)
habitat_sim/simulator.py	96.04% <100.00%> (+0.11%)	⬆️

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