python bindings: get version from package.xml

[scpeters]

🎉 New feature

Similar to https://github.com/gazebosim/gz-math/pull/642 using https://github.com/gazebosim/gz-cmake/pull/456 from gz-cmake 4.1.0

Summary

When building python bindings separately from the main library, the major version of libsdformat has been hard-coded, but this changes it to parse the version number from the package.xml file in this repository using a gz-cmake feature added in https://github.com/gazebosim/gz-cmake/pull/456 and released in 4.1.0. We could also consider using this feature in the root CMakeLists.txt file, but for now it is just used when building python bindings separately from the main library.

Test it

1. Configure the python folder:

cd python
mkdir build
cd build
cmake ..

2. Verify that it found sdformat15

-- Looking for sdformat15 -- found version 15.0.0

Checklist

• [X] Signed all commits for DCO
• [ ] Added tests
• [ ] Added example and/or tutorial
• [ ] 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)
• [ ] 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

All modified and coverable lines are covered by tests :white_check_mark:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## sdf15 #1504 +/- ## ======================================== Coverage ? 92.47% ======================================== Files ? 138 Lines ? 18326 Branches ? 0 ======================================== Hits ? 16947 Misses ? 1379 Partials ? 0 ```

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