WIP: Add general entity protobuf

[JAORMX]

Summary

Change Type

Mark the type of change your PR introduces:

• [ ] Bug fix (resolves an issue without affecting existing features)
• [x] Feature (adds new functionality without breaking changes)
• [ ] Breaking change (may impact existing functionalities or require documentation updates)
• [ ] Documentation (updates or additions to documentation)
• [ ] Refactoring or test improvements (no bug fixes or new functionality)

Testing

Outline how the changes were tested, including steps to reproduce and any relevant configurations. Attach screenshots if helpful.

Review Checklist:

• [x] Reviewed my own code for quality and clarity.
• [ ] Added comments to complex or tricky code sections.
• [ ] Updated any affected documentation.
• [ ] Included tests that validate the fix or feature.
• [ ] Checked that related changes are merged.

[coveralls]

coverage: 53.875% (+0.005%) from 53.87% when pulling 83a1fc1182ca7f6d34daf4da92c4674a0656fd27 on entity-protobuf into b10735277c13ccdd9807d2f989993447a7336f73 on main.