DM-37950: Allow the raw definition to be specified in the instrument class

[timj]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

Base: 80.61% // Head: 80.67% // Increases project coverage by +0.06% 🎉

Coverage data is based on head (6a94f3a) compared to base (e56e3bd).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #305      +/-   ##
==========================================
+ Coverage   80.61%   80.67%   +0.06%     
==========================================
  Files          57       57              
  Lines        6319     6318       -1     
  Branches     1280     1280              
==========================================
+ Hits         5094     5097       +3     
+ Misses        982      978       -4     
  Partials      243      243              

Impacted Files	Coverage Δ
tests/test_quantumGraph.py	96.58% <ø> (+1.25%)	⬆️
python/lsst/pipe/base/_instrument.py	76.41% <100.00%> (+0.45%)	⬆️
tests/test_instrument.py	97.80% <100.00%> (+0.10%)	⬆️

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