TASK: Add simple memory system to the `Person`

[TheGittyPerson]

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Difficulty: Upper Beginner to Lower Intermediate

TODO:

• Add the remember() method to the Person class in person.py.
• The method should store a string in a protected instance variable (_memory).
• Add another method, recall() that returns _memory.
• This method should also have a parameter say of type bool that defaults to False. If this is set to true, the method must first say() the memory before returning.
• Also add a forget() method.
• 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 feat/memory-system
4. Push commits to your remote fork
5. Create a PR titled TASK: Add simple memory system to the `Person` (#137)
6. At the end of the PR description, add Closes #137
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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