Implement vector3 with common widget vector3

[AzulRadio]

Signed-off-by: youhy [email protected]

• Part of Provide reusable QML components with common widgets gz-gui#310

New feature

Summary

Implement Gravity and Magnetic Field in Component Inspector with common widget GzVector3 introduced in gz-gui#427

Behavior should be exactly the same as before.

Test it

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• 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

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[codecov]

Codecov Report

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❗ Current head a9881b9 differs from pull request most recent head dd3c1d9. Consider uploading reports for the commit dd3c1d9 to get more accurate results

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