refactor!: isEnabled getter and setter

[alestiago]

Description

Removed setEnabled and isEnabled. Also updated documentation for the new getter and setter.

// Before:
contact.setEnabled(true);
contact.isEnabled(); // true

// After:
contact.isEnabled = true;
contact.isEnabled; // true

Checklist

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

Breaking Change

• Yes, this is a breaking change.
• No, this is not a breaking change.

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