Issue/85/read keys

[eacharles]

Problem & Solution Description (including issue #)

85

Code Quality

• [ x] My code follows the code style of this project
• [ x] I have written unit tests or justified all instances of #pragma: no cover; in the case of a bugfix, a new test that breaks as a result of the bug has been added
• [ ] My code contains relevant comments and necessary documentation for future maintainers; the change is reflected in applicable demos/tutorials (with output cleared!) and added/updated docstrings use the NumPy docstring format
• [ ] Any breaking changes, described above, are accompanied by backwards compatibility and deprecation warnings

[codecov[bot]]

Codecov Report

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

Comparison is base (70659a6) 99.53% compared to head (af3d2bc) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #86 +/- ## =========================================== + Coverage 99.53% 100.00% +0.46% =========================================== Files 8 8 Lines 641 658 +17 =========================================== + Hits 638 658 +20 + Misses 3 0 -3 ``` | [Files](https://app.codecov.io/gh/LSSTDESC/tables_io/pull/86?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC) | Coverage Δ | | |---|---|---| | [src/tables\_io/ioUtils.py](https://app.codecov.io/gh/LSSTDESC/tables_io/pull/86?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC#diff-c3JjL3RhYmxlc19pby9pb1V0aWxzLnB5) | `100.00% <100.00%> (ø)` | | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/LSSTDESC/tables_io/pull/86/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LSSTDESC)

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