Feature/remove unnecessary required vars

[vgro]

This PR removes unnecessary variables from required_vars and moves the bounds for variables to the constants file.

Type of change

• [ ] New feature (non-breaking change which adds functionality)
• [x] Optimization (back-end change that speeds up the code)
• [ ] Bug fix (non-breaking change which fixes an issue)

Key checklist

• [x] Make sure you've run the pre-commit checks: $ pre-commit run -a
• [x] All tests pass: $ poetry run pytest

Further checks

• [x] Code is commented, particularly in hard-to-understand areas
• [x] Tests added that prove fix is effective or that feature works

[codecov-commenter]

Codecov Report

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

Project coverage is 93.20%. Comparing base (c94cef6) to head (8ce2eb1).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #407 +/- ## =========================================== + Coverage 93.19% 93.20% +0.01% =========================================== Files 60 60 Lines 2953 2959 +6 =========================================== + Hits 2752 2758 +6 Misses 201 201 ```

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