Replace func as key with str

[nstarman]

Description

NumPy does weird function replacement in a lot of places, so lookup tables using the function don't work. Thankfully all the substituted functions share the same module and name, so these must be the lookup keys.

PR Checklist

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• Give a detailed description of the PR above.
• Document changes in the CHANGES.rst file. See existing changelog for examples.
• Add tests, if applicable, to ensure code coverage never decreases.
• Make sure the docs are up to date, if applicable, particularly the docstrings and RST files in docs folder.
• Ensure linear history by rebasing, when requested by the maintainer.

[codecov]

Codecov Report

Base: 94.24% // Head: 93.67% // Decreases project coverage by -0.57% ⚠️

Coverage data is based on head (09fe82e) compared to base (81efd58).
Patch coverage: 93.75% of modified lines in pull request are covered.

❗ Current head 09fe82e differs from pull request most recent head bb383c0. Consider uploading reports for the commit bb383c0 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
- Coverage   94.24%   93.67%   -0.58%     
==========================================
  Files           7        7              
  Lines         226      237      +11     
==========================================
+ Hits          213      222       +9     
- Misses         13       15       +2     

Impacted Files	Coverage Δ
src/overload_numpy/overload.py	89.01% <89.47%> (-1.24%)	⬇️
src/overload_numpy/assists.py	100.00% <100.00%> (ø)
src/overload_numpy/constraints.py	100.00% <100.00%> (ø)
src/overload_numpy/mixin.py	80.95% <100.00%> (+2.00%)	⬆️
src/overload_numpy/npinfo.py	100.00% <100.00%> (ø)

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