sdf2usd: set cylinder refinement parameter (backport #34)

[mergify]

🦟 Bug fix

Summary

The refinement parameter is 0 by default when loaded in Isaac Sim, which makes cylinders look like extruded polygons. Setting the refinement parameter to 1 makes them rounder.

Thanks to @rgasoto for the assistance with the OpenUSD API.

Example with unrefined cylinders

Note the polygonal shape of the pendulum bases

Example with refinement == 1

Note the rounder shape of the pendulum bases

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

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.

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This is an automatic backport of pull request #34 done by [Mergify](https://mergify.com).