Fixed usd2sdf when import from model://

[ahcorde]

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

🦟 Bug fix

Summary

Moved from here https://github.com/gazebosim/sdformat/pull/1023

Added the model:// path to the set of folder where sdf should look for models and textures

FYI @rbonghi

SDF_PATH="models" IGN_FILE_PATH="models" sdf2usd worlds/office.sdf office.usda

Checklist

• [x] Signed all commits for DCO
• [ ] Added tests
• [ ] Updated documentation (as needed)
• [ ] Updated migration guide (as needed)
• [ ] Consider updating Python bindings (if the library has them)
• [x] codecheck passed (See contributing)
• [x] All tests passed (See test coverage)
• [x] 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[bot]]

Codecov Report

Attention: Patch coverage is 5.88235% with 16 lines in your changes missing coverage. Please review.

Project coverage is 64.84%. Comparing base (157a5a1) to head (10d1792). Report is 6 commits behind head on main.

Files	Patch %	Lines
src/sdf_parser/Geometry.cc	5.88%	16 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #10 +/- ## ========================================== - Coverage 65.17% 64.84% -0.34% ========================================== Files 29 29 Lines 2958 2975 +17 ========================================== + Hits 1928 1929 +1 - Misses 1030 1046 +16 ```

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