feat: better color object

[tlambert03]

closes #184. Metadata.channel.color is now an (r,g,b,a) tuple. If you want the original Elements integer format, use color.as_abgr_u4()

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 95.19%. Comparing base (d1853b0) to head (b37c434).

Files	Patch %	Lines
src/nd2/structures.py	88.23%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #218      +/-   ##
==========================================
- Coverage   95.25%   95.19%   -0.06%     
==========================================
  Files          18       18              
  Lines        2422     2436      +14     
==========================================
+ Hits         2307     2319      +12     
- Misses        115      117       +2     

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[codspeed-hq]

CodSpeed Performance Report

Merging #218 will not alter performance

_{Comparing color (b37c434) with main (d1853b0)}

Summary

✅ 13 untouched benchmarks