Double32 format support in progress

[dbizdfvy]

No description provided.

[nsmith-]

Overall looks very good!
Can you run nox -s lint and let it fix the formatting issues to ensure the linter is happy?
I see that the _FixedSizeArrayReader will still need an implementation that calls into Double32Serde. Perhaps we can make that a later project.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 87.09677% with 8 lines in your changes missing coverage. Please review.

Project coverage is 90.83%. Comparing base (a7f106b) to head (1d6213f).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/rootfilespec/bootstrap/double32.py	83.67%	8 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   90.75%   90.83%   +0.07%     
==========================================
  Files          33       34       +1     
  Lines        2412     2476      +64     
==========================================
+ Hits         2189     2249      +60     
- Misses        223      227       +4     

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[nsmith-]

LGTM