[Humble] Added support for Flir PTU-5.

[mergify]

Backport of #330 to Humble.

[mergify]

Cherry-pick of 209b636 has failed:

On branch mergify/bp/humble/pr-330
Your branch is up to date with 'origin/humble'.

You are currently cherry-picking commit 209b636.
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  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	new file:   clearpath_sensors_description/urdf/flir_ptu.urdf.xacro

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   .github/workflows/ci.yml
	both modified:   clearpath_generator_common/clearpath_generator_common/description/sensors.py
	both modified:   clearpath_generator_common/clearpath_generator_common/param/platform.py
	both modified:   clearpath_sensors_description/package.xml

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