tic: Add I²C support for Tic Stepper Motor Controllers

[z-riley]

This PR adds functionality for interfacing with Pololu Tic Stepper Motor Controllers over I²C.

The tic package is based on github.com/pololu/tic-arduino, with adoption of Go-style error handling, periph/conn, and other usability improvements.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 40.31008% with 231 lines in your changes missing coverage. Please review.

Project coverage is 47.6%. Comparing base (853aec6) to head (cbc94b0).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
tic/tic.go	33.1%	222 Missing and 6 partials ⚠️
tic/registers.go	93.5%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #78     +/-   ##
=======================================
+ Coverage   47.1%   47.6%   +0.5%     
=======================================
  Files         83      87      +4     
  Lines      10280   10935    +655     
=======================================
+ Hits        4837    5203    +366     
- Misses      5263    5538    +275     
- Partials     180     194     +14     

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[maruel]

Thanks, this is excellent! The only blocking thing is that I believe Offset and its constants don't need to be exposed since they are not usable by the user.

[maruel]

Thanks!