Add support for ddd KVN dates

[matzipan]

I would have preferred to import lox-time and convert with from_day_of_year, but lox-time already depends on lox-io so it would be a circular dependency.

A more involved solution would be to break up lox-io on smaller crates and only have the NDM stuff depend on lox-time.

Open to suggestions

Closes #120

1.5

[codecov]

Codecov Report

Attention: Patch coverage is 91.17647% with 3 lines in your changes missing coverage. Please review.

Project coverage is 70.90%. Comparing base (2d1e3f2) to head (003a516).

Files with missing lines	Patch %	Lines
crates/lox-io/src/ndm/kvn/parser.rs	91.17%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #206      +/-   ##
==========================================
- Coverage   70.91%   70.90%   -0.01%     
==========================================
  Files          82       82              
  Lines       21801    21805       +4     
==========================================
+ Hits        15460    15461       +1     
- Misses       6341     6344       +3     

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[codspeed-hq]

CodSpeed Performance Report

Merging #206 will not alter performance

_{Comparing az/add-support-for-ddd-format (f55819e) with main (ba514f3)}

Summary

✅ 1 untouched benchmarks