chore: Bumps version to 0.3.0 and updates changelog.

[vlidholt]

Description

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Related Issues

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• (Closes/Fixes): #<issue_number>

Pre-Launch Checklist

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• This update focuses on a single feature or bug fix. (For multiple fixes, please submit separate PRs.)
• I have read and followed the Dart Style Guide and formatted the code using dart format.
• I have referenced at least one issue this PR fixes or is related to.
• I have updated/added relevant documentation (doc comments with ///), ensuring consistency with existing project documentation.
• I have added new tests to verify the changes.
• All existing and new tests pass successfully.
• I have documented any breaking changes below.

Breaking Changes

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• No breaking changes.

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Additional Notes

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[SandPod]

Sort the changelog and then I'm happy! 🚀