types: cleanup

[tcoratger]

🗒️ Description

@anshalshukla I've reorganized a bit the types for each of them to be at appropriate places and I've removed types that are not used anymore about naive signature aggregation. Let me know what you think about it

🔗 Related Issues or PRs

✅ Checklist

• Ran tox checks to avoid unnecessary CI fails:

  uvx tox

• Considered adding appropriate tests for the changes.
• Considered updating the online docs in the ./docs/ directory.