DOC :  Add Class Diagram (Inheritance) for the groupby and dtypes Directory
Highlights inheritance
This pull request introduces a comprehensive class diagram for the groupby and dtypes directory in pandas, providing a high-level overview of the module's architecture. helping developers better understand the structure and functionality of the groupby and dtypes module.

Thanks for the PR, but we don't currently support maintaining class diagrams in the project as the internals are subject to change which would make these outdated quickly.

Going to close, but happy to have contributions for open issues labeled `good first issue`