refactor!: removed wrapper get and set methods for GearJoint.ratio

[alestiago]

Description

Removes setRatio and getRatio which were only wrapping around ratio.

// Before
gearJoint.setRatio(0.2)
geatJoint.getRatio() // 0.2

// After
geatJoint.ratio = 0.2
geatJoint.ratio; // 0.2

Checklist

• [X] The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs: etc).
• [X] I have read the Contributor Guide and followed the process outlined for submitting PRs.
• [X] I have updated/added tests for ALL new/updated/fixed functionality.
• [X] I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• [X] I have updated/added relevant examples in examples.

Breaking Change

• [X] Yes, this is a breaking change.
• [ ] No, this is not a breaking change.

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