feat: implement autodiscover mechanism for automatic model registration

[remifu93]

Description

This PR introduces a centralized autodiscovery mechanism in historical.py that automatically registers models for historical tracking. The purpose is to isolate and unify all registration logic in a single place for better code organization and scalability.

Motivation and Context

• Centralizes register() logic for historical models into a dedicated module.
• Eliminates the need to manually call registration in multiple places.
• Encourages a cleaner, more scalable project structure.
• Reduces the risk of missing or duplicated model registrations.
• Enables plug-and-play behavior: importing the module is enough to apply the registration.

How Has This Been Tested?

• Manually tested in a Django project to confirm that historical models are registered correctly.
• Verified that historical tracking works as expected after migrations.
• Ran the full test suite to ensure no regressions.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist

• I have run the pre-commit run command to format and lint.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have added my name and/or GitHub handle to AUTHORS.rst
• I have added my change to CHANGES.rst
• All new and existing tests passed.