Small Refactoring for include_state

[kenko911]

Summary

Refactor include_states to include_state for consistency Major changes:

• feature 1: ...
• fix 1: ...

Todos

If this is work in progress, what else needs to be done?

• feature 2: ...
• fix 2:

Checklist

• [ x] Google format doc strings added. Check with ruff.
• [ x] Type annotations included. Check with mypy.
• [ x] Tests added for new features/fixes.
• [ x] If applicable, new classes/functions/modules have duecredit @due.dcite decorators to reference relevant papers by DOI (example)

Tip: Install pre-commit hooks to auto-check types and linting before every commit:

pip install -U pre-commit
pre-commit install

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.80%. Comparing base (08a0338) to head (904da58).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #239 +/- ## ======================================= Coverage 98.80% 98.80% ======================================= Files 33 33 Lines 2750 2750 ======================================= Hits 2717 2717 Misses 33 33 ```

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