TASK: Add `change_name()` method

[TheGittyPerson]

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Difficulty: Upper Beginner to Lower Intermediate

TODO:

• Add the change_name() method to the Profile dataclass in person.py (with type checks and stuff)
• Remember to add type hints and docstrings where necessary and follow PEP 8

PR steps:

1. Fork this repo
2. Clone the forked repo
3. Create a new branch and name it feature/change-name-method
4. Push commits to your remote fork
5. Create a PR titled TASK: Add `change_name()` method (#134)
6. At the end of the PR description, add Closes #134
7. Submit the PR (Ensure you allow maintainers to edit)

Please make sure you have read the Contributing Guidelines before working.

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