airbyte-ci: enable mypy checks on the project

[alafanechere]

Objective:

Propose the integration of MyPy for type checking in the Airbyte-CI Python CLI project to improve code quality.

Reasons for adding MyPy:

• Early Bug Detection: MyPy catches potential type-related errors during development, preventing issues at runtime. We've suffered from multiple regression in the past for this kind of error.

• Code Readability: Type hints from MyPy serve as documentation, making the codebase more understandable for collaborators.

• Improved Development Experience: MyPy enhances the development experience with better IDE support and more accurate autocompletion.

• Maintainability: As the project grows, MyPy enforces a consistent and clear code structure, enhancing maintainability.

Benefits:

• Enhanced Code Quality: MyPy enforces type correctness, contributing to a more robust and reliable codebase.

• Reduced Bugs: Early detection of potential bugs through static type checking leads to a more stable application.

• Improved Collaboration: Clear type hints make the codebase more understandable, facilitating collaboration.

• Better Maintenance: MyPy aids in maintaining a well-structured codebase, making it easier for developers to work on and extend the project.