Added Model Python interface

[ahcorde]

Signed-off-by: ahcorde ahcorde@gmail.com

🎉 New feature

This PR is part of this meta ticket #931

Require

• Added Visual Python interface #950
• Added Link Python interface #952
• Added Joint Python interface #961

Summary

Added Model Python interface

Test it

from sdformat import Model

model = Model()

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.

[azeey]

I think all the return_value_policy::reference in pyModel.cc should all be
return_value_policy::reference_internal since the model should outlive the
objects it's returning by reference/pointer. Otherwise, LGTM!

[azeey]

Indent with 4 spaces.

[codecov-commenter]

Codecov Report

Merging #963 (6325ac8) into main (f7f3417) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #963   +/-   ##
=======================================
  Coverage   66.66%   66.66%           
=======================================
  Files           2        2           
  Lines          27       27           
=======================================
  Hits           18       18           
  Misses          9        9           

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