Max7219 LED Driver

[gsexton]

This commit adds a driver for the Maxim 7219 LED Driver.

[codecov]

Codecov Report

Attention: Patch coverage is 76.11940% with 64 lines in your changes missing coverage. Please review.

Project coverage is 47.8%. Comparing base (9ab07ba) to head (9a92300).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
max7219/max7219.go	75.0%	55 Missing and 9 partials ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #79     +/-   ##
=======================================
+ Coverage   47.1%   47.8%   +0.7%     
=======================================
  Files         83      85      +2     
  Lines      10280   10548    +268     
=======================================
+ Hits        4839    5041    +202     
- Misses      5261    5318     +57     
- Partials     180     189      +9     

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[gsexton]

@maruel Is there something broken? It's showing a fail on codecov/project.

[maruel]

Can you rebase on main? I just merged #80 which should fix the regression because I just reenabled codecov but the project coverage was too low.

[maruel]

Thanks! A few minors comments but nothing really blocking.

[maruel]

I noticed a few other items but they can be done in a follow up.

[maruel]

Thanks!