Added Frame Python interface

[ahcorde]

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

🎉 New feature

This PR is part of this meta ticket #931

Summary

Added Frame Python interface

Test it

from sdformat import Frame

frame = Frame()

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 #962 (4b27481) into main (bb84733) will not change coverage.
The diff coverage is n/a.

❗ Current head 4b27481 differs from pull request most recent head b97914f. Consider uploading reports for the commit b97914f to get more accurate results

@@           Coverage Diff           @@
##             main     #962   +/-   ##
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  Coverage   66.66%   66.66%           
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  Files           2        2           
  Lines          27       27           
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  Hits           18       18           
  Misses          9        9           

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