NavSat::ToElement() method (backport #1585)

[mergify]

🦟 Bug fix

Fixes #

Summary

sdf::NavSat didn't have a ToElement() method which prevent to convert sensor-specific information back to sdf format.

This PR include such changes:

• Introduce sdf::NavSat::ToElement() method
• Added this method call to dispatcher in Sensor::ToElement()
• Also same dispatcher had misleading error msg: if user tried to convert sensor w/o sensor-specific information it will get error message about lack of this feature, but actually it's not correct. Dispatcher logic changed to avoid such misleading (split apart type check and pointer check)
• And message was w/o trailing new_line symbol which makes console output harder to read
• Added test for new ToElement() method; valgrind is happy
• Couple of typos fixed

This PR was developed on top of sdf15 and retargeted to sdf16 due to sdf16 do not have dev packages.

Checklist

• 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)
• 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
• Was GenAI used to generate this PR? If so, make sure to add "Generated-by" to your commits. (See this policy for more info.)

Note to maintainers: Remember to use Squash-Merge and edit the commit message to match the pull request summary while retaining Signed-off-by and Generated-by messages.

---

This is an automatic backport of pull request #1585 done by Mergify.

[mergify]

Cherry-pick of 8ccc60c has failed:

On branch mergify/bp/sdf15/pr-1585
Your branch is up to date with 'origin/sdf15'.

You are currently cherry-picking commit 8ccc60cd.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   include/sdf/Error.hh
	modified:   include/sdf/NavSat.hh
	modified:   src/Geometry.cc
	modified:   src/NavSat.cc
	modified:   src/NavSat_TEST.cc
	modified:   src/ScopedGraph.hh
	modified:   src/Sensor.cc

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   src/Surface.cc

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[scpeters]

I rebased and resolved conflicts