Issue/57/util stages

[eacharles]

Change Description

• [ ] My PR includes a link to the issue that I am addressing

Solution Description

Code Quality

• [ ] I have read the Contribution Guide
• [ ] My code follows the code style of this project
• [ ] My code builds (or compiles) cleanly without any errors or warnings
• [ ] My code contains relevant comments and necessary documentation

Project-Specific Pull Request Checklists

Bug Fix Checklist

• [ ] My fix includes a new test that breaks as a result of the bug (if possible)
• [ ] My change includes a breaking change
  • [ ] My change includes backwards compatibility and deprecation warnings (if possible)

New Feature Checklist

• [ ] I have added or updated the docstrings associated with my feature using the NumPy docstring format
• [ ] I have updated the tutorial to highlight my new feature (if appropriate)
• [ ] I have added unit/End-to-End (E2E) test cases to cover my new feature
• [ ] My change includes a breaking change
  • [ ] My change includes backwards compatibility and deprecation warnings (if possible)

Documentation Change Checklist

• [ ] Any updated docstrings use the NumPy docstring format

Build/CI Change Checklist

• [ ] If required or optional dependencies have changed (including version numbers), I have updated the README to reflect this
• [ ] If this is a new CI setup, I have added the associated badge to the README

Other Change Checklist

• [ ] Any new or updated docstrings use the NumPy docstring format.
• [ ] I have updated the tutorial to highlight my new feature (if appropriate)
• [ ] I have added unit/End-to-End (E2E) test cases to cover any changes
• [ ] My change includes a breaking change
  • [ ] My change includes backwards compatibility and deprecation warnings (if possible)

[codecov[bot]]

Codecov Report

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

Comparison is base (678bdd0) 97.13% compared to head (d9b103c) 97.13%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #61 +/- ## ======================================= Coverage 97.13% 97.13% ======================================= Files 32 32 Lines 1676 1676 ======================================= Hits 1628 1628 Misses 48 48 ``` | [Files](https://app.codecov.io/gh/LSSTDESC/rail_base/pull/61?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC) | Coverage Δ | | |---|---|---| | [src/rail/core/\_\_init\_\_.py](https://app.codecov.io/gh/LSSTDESC/rail_base/pull/61?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC#diff-c3JjL3JhaWwvY29yZS9fX2luaXRfXy5weQ==) | `100.00% <100.00%> (ø)` | | | [src/rail/core/util\_stages.py](https://app.codecov.io/gh/LSSTDESC/rail_base/pull/61?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC#diff-c3JjL3JhaWwvY29yZS91dGlsX3N0YWdlcy5weQ==) | `100.00% <ø> (ø)` | |

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