Fix add more type hints

[alm0ra]

Changes

Add more type hints to integrate with Mypy reference #980

Checklist

• [x] I think the code is well written
• [x] Unit tests for the changes exist
• [x] Documentation reflects the changes
• [x] Add a new news fragment into the CHANGES folder

[ods]

PR #978 is already merged into master, so it looks like a duplicate. Therefore closing this one.