aegis_description - Launch script to generate stadalone URDF model

[macmacal]

Description

• This simple launch file script enables automatic generation of the whole URDF model with an extra copy of all 3D models.

Motivation and context

• The main goal is to sew off all ROS dependencies from the aegis_gym project.
• The export of whole robot model (in the URDF model) for external simulators (e.g. genesis sim).

How has this been tested?

• Manually, on the development laptop

Checklist

• All TODOs in the code have been resolved or linked to a proper issue.
• Code has been (auto)formatted.
• Documentation (e.g., README, CHANGELOG, Wiki) has been updated.
• All automated checks have passed.

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Clickup task: 869bu1x36

[sivral]

Looks good to me.