Added Physics Python interface

[ahcorde]

Signed-off-by: ahcorde [email protected]

🎉 New feature

This PR is part of this mete ticket #931

Summary

Added Physics Python interface

Test it

from sdformat import Physics

physics = Physics()

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 and edit the commit message to match the pull request summary while retaining Signed-off-by messages.

[codecov-commenter]

Codecov Report

Merging #995 (9d830bb) into main (bb84733) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #995   +/-   ##
=======================================
  Coverage   66.66%   66.66%           
=======================================
  Files           2        2           
  Lines          27       27           
=======================================
  Hits           18       18           
  Misses          9        9           

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[codecov]

Codecov Report

Merging #995 (c9e20c3) into main (50032e9) will decrease coverage by 0.07%.
The diff coverage is 55.55%.

@@            Coverage Diff             @@
##             main     #995      +/-   ##
==========================================
- Coverage   83.23%   83.16%   -0.08%     
==========================================
  Files         152      153       +1     
  Lines       18594    18648      +54     
==========================================
+ Hits        15477    15508      +31     
- Misses       3117     3140      +23     

Impacted Files	Coverage Δ
python/src/sdf/pyWorld.cc	53.21% <44.44%> (-1.74%)	⬇️
python/src/sdf/pyPhysics.cc	60.00% <60.00%> (ø)
python/src/sdf/_ignition_sdformat_pybind11.cc	100.00% <100.00%> (ø)
src/World.cc	95.27% <0.00%> (+0.24%)	⬆️

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[azeey]

Looks good. Missing one member function, I think.

[azeey]

LGTM! Just one minor comment

[azeey]

Suggested change

	def test_set_scene(self):
	def test_set_physics(self):

[azeey]

pyWorld_TEST is failing. And it looks like Jenkins is not capturing test failures from python tests. There are a bunch of failures on homebrew, but the test results shows 0 failures. Is this a known issue?