refactor!: bullet getter and setter

[alestiago]

Description

Removes setBullet and isBuller in favour of setter and getters.

// Before:
body.setBullet(true);
body.isBullet(); // true

// After:
body.bullet = true;
body.bullet; // true

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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