Display version from the gz-physics plugin

[j-rivero]

Summary

This PR updates gz-sim to display physics engine version information in the Component Inspector by extending the PhysicsEnginePlugin component to use the new GetEngineVersion() API from gz-physics.

Dependencies:

• Requires gz-physics PR that adds GetEngineVersion() API Add GetEngineVersion to GetEngineInfo gz-physics#821

Changes:

• Updated PhysicsEnginePlugin component to store engine name with version in "name-version" format
• Physics engine version now dynamically retrieved and displayed (e.g., "dartsim-6.13.0", "bullet-3.24", "tpe-1.0")
• Removed need for separate version component by extending existing PhysicsEnginePlugin

User-visible changes:

• Component Inspector now shows physics engine with version when selecting world entity
• Example: PhysicsEnginePlugin: "dartsim-6.13.0" (previously showed library path or hardcoded name)

Implementation details:

• Calls engine->GetName() and engine->GetVersion() from gz-physics API
• Concatenates name and version with hyphen separator when version is non-empty
• Updates component data in both static and dynamic plugin loading paths

Test it

Build from source the gz-physics PR and this branch. Launch any world and see the GUI:

Expected output in Component Inspector:

• bullet: "bullet-3.24"
• bullet-featherstone: "bullet-featherstone-3.24"
• dartsim: "dartsim-6.13.0" (or current DART version)
• tpe: "tpe-1.0"

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed) - Added changelog entry
• Updated migration guide (as needed) - Non-breaking change
• 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.)

Generated-with: GitHub Copilot (Claude Sonnet 4.5)