Fix build with urdfdom 4.0.0

[scpeters]

There is a parsePose method in urdfdom 4.0.0 with the same signature as the function defined locally in urdf_world_parser, which causes build errors due to an ambiguous call. This adds urdf_parsing:: to the reference to parsePose to eliminate the ambiguity. Needed for Homebrew/homebrew-core#158963.

I was confused about why this error occurs since I don't see using namespace urdf; anywhere, but I believe it's due to argument-dependent lookup (thanks @azeey for the pointer).

Before creating a pull request

• Document new methods and classes
• Format new code files using ClangFormat by running make format
• Build with -DDART_TREAT_WARNINGS_AS_ERRORS=ON and resolve all the compile warnings

Before merging a pull request

• Set version target by selecting a milestone on the right side
• Summarize this change in CHANGELOG.md
• Add unit test(s) for this change
• Add Python bindings for new methods and classes

[jslee02]

Thank you for the fix!

[scpeters]

thanks!