chore: version bump 3.0.0

[MusicalNinjaDad]

Summary by Sourcery

This pull request updates the project to version 3.0.0, introducing a new feature where fizzbuzzo3.fizzbuzz returns list[str] when passed a list or slice, and continues to return str when passed a single int. Additionally, it includes performance enhancements by allowing a slice to be passed to fizzbuzzo3.fizzbuzz and building rust with --release optimisations. The changelog has been updated to document these changes.

• New Features:
  • Return list[str] when passed a list or slice, continue to return str when passed a single int.
• Enhancements:
  • Allow a slice to be passed to fizzbuzzo3.fizzbuzz, providing a 1.5x speed increase over passing a list with the same elements.
  • Build rust with --release optimisations, resulting in a 4-7x speed increase.
• Documentation:
  • Updated CHANGELOG.md to reflect changes in version 3.0.0.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request updates the version of the FizzBuzz project to 3.0.0. The changes include updating the version number in the CHANGELOG.md file and adding a new feature that returns a list of strings when passed a list or slice, while continuing to return a string when passed a single integer.

File-Level Changes

Files	Changes
CHANGELOG.md	Updated the version number and added a new feature description in the changelog.

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